None of the mistakes below are dramatic. That is exactly why they last. A creator can send the same flawed media kit for a year, watch reply rates sit lower than they should, and never trace it back to the document, because nothing about it looks obviously broken.
These six show up repeatedly across kits that otherwise look professional, and they compound with the channel rather than staying fixed. A kit with a blended stat or a stale number costs more on a 100,000-follower channel than it does on a 10,000-follower one, simply because the gap between the real number and the reported one grows in absolute terms as the channel does. Each one below is a quiet cost, not a visible failure, which is what makes them worth checking for directly rather than waiting to notice.
Inflating or Blending Stats
The most common version: reporting "50K+ across platforms" instead of listing each platform's real number separately. A brand doing basic diligence checks the actual accounts within a minute, and a blended figure that turns out to be 46,000 Instagram followers plus a small, inactive TikTok reads as an attempt to inflate the headline number, even if that was not the intent.
The fix costs nothing: list each platform's real stats on its own line. A 46,000-follower Instagram account with a genuine 3.8% engagement rate is a perfectly sellable kit on its own. Padding it with an unrelated platform's follower count does not make the pitch stronger, it makes the whole document less trustworthy the moment a brand checks.
Accurate stats, honestly labelled. The account tier reads Micro. That is not a weakness the pricing needs to hide.
Sending a Stale Kit
A media kit built six months ago and never revisited is the second-most common mistake, and the hardest one to notice from the inside. Growth compounds quietly. A channel that has grown 40% since the kit's last update is systematically undercharging on every deal that uses it, and the creator has no obvious signal that this is happening, since each individual deal still looks reasonable in isolation.
A Niche That Is Too Broad
"Lifestyle content" or "general entertainment" as a stated niche gives a brand nothing to target against. It is the difference between a media kit a brand can immediately place, and one that requires a follow-up question before the conversation can even continue.
SponsorCraft prices against 19 creator niches and 111 sub-niches, so a coffee and beverages channel and a food reviews and mukbang channel are not priced as the same food audience. A media kit should make that same distinction visible before pricing ever enters the conversation. Naming the specific sub-niche, not just the broad category, does the work of pre-qualifying which brands are actually a fit.
No Rate Range at All
Leaving pricing out of the kit entirely is standard advice, and it is correct: a media kit introduces a creator, a rate card prices a specific deal, and the two are sequential documents for a reason. The mistake is not leaving pricing out. It is having no rate range anywhere, not even a private one the creator can reference the moment a brand asks.
A creator who has never actually priced their own numbers tends to answer the first "what's your rate" question reactively, often too low, because there was no number ready to reference. Having a current rate range worked out in advance, even if it never appears on the kit itself, changes that conversation from reactive to prepared.
A Contact Method With No Clear Next Step
The fifth mistake is subtler than the first four: a kit that lists an email address and nothing else, with no indication of what happens after a brand sends that first message. Brands managing several creator outreach conversations at once respond faster to a kit that makes the next step obvious, a specific line like "media kit and rate card available on request" tells a brand exactly what to expect next, rather than leaving them to guess whether a reply means a negotiation is starting or just a form response.
This costs nothing to fix and takes one sentence. The absence of it does not kill a deal outright, but it adds friction to every single inquiry, and friction compounds across dozens of brand conversations the same way a stale number compounds across dozens of deals.
A Template Copied Without Adjusting the Assumptions
The sixth mistake shows up most in kits built from a downloaded template rather than from scratch: sections, phrasing, or even example numbers left over from whoever the template was originally built for. A demographics section that still says "Ages 18 to 24, primarily US" because that was the placeholder, not because it reflects this channel's actual audience, undermines every other number on the page the moment a brand notices the mismatch.
Templates are a legitimate starting point, not a finished document. Every section pulled from one needs to be checked against this channel's real numbers before the kit goes out, not just formatted to match the template's layout.
SponsorCraft is not a subscription and does not require an account to check what a channel's own numbers are worth. The YouTube calculator is free forever, which is enough to have a real number ready before the first brand ever asks.
Check your own numbers →None of these six mistakes require a full rebuild to fix. Most are a single afternoon: separate blended stats by platform, refresh the numbers, narrow the stated niche, and price a private rate range even if it stays off the document itself.
a current price.
The YouTube calculator is free forever with no account and no email. Run your own numbers through it before the next pitch goes out.
For a full section-by-section rebuild rather than a mistakes checklist, start with the creator media kit guide, part of the complete guide to sponsorship pricing. To know exactly when the numbers are due for a refresh, see how often to update a rate card, and check the corrected number against the sponsorship calculator before sending it out again.