What 30 Videos Tell You About Selling Aptitude
One good video is luck. Thirty is a habit. How a recent sample of a creator's posts reveals whether they can actually sell.

A creator's last thirty videos tell you more about whether they can sell than any number on their profile. Not because thirty is magic. Because thirty is enough to show a pattern, and a pattern is what predicts the next sale. One good video is luck. Thirty is a habit.
Why a single video proves nothing
A viral video says the algorithm liked one post. It does not say the creator can repeat it, or that the audience buys. A creator can go viral and sell nothing. So the sample has to be big enough to separate a fluke from a pattern, and recent enough that the pattern still holds.
What you are looking for across the set
The share of posts that sell something. The category they sell in. Whether the audience engages with the product or the performance. Whether the sponsored posts convert. Read across thirty and the questions answer themselves: this creator sells this category, this often, to this audience. A single post never tells you that.
Why recency is the other half
Thirty old videos describe who the creator was. Thirty recent ones describe who they are now. A creator who sold well a year ago and posts nothing but entertainment today is a different bet. The sample has to be current, or the pattern is history.