Two creators with similar audiences often quote very different fees. The gap is usually not audience quality, it is what the advertiser is allowed to do with the material afterwards.
The post is the smallest part of the deal
A single post appears in a feed and decays within days. As an asset that is a modest thing to buy.
The material itself has a longer life. It can run as paid media, appear on a product page, be cut into other formats, or be used in retail displays.
Each of those uses reaches an audience the creator was never paid to reach, which is why the rights are itemised rather than assumed.
The three terms that set the price
Duration, media and territory do most of the work. A three-month right to run in paid social in one market is a fundamentally different purchase from perpetual worldwide use in any medium.
Exclusivity is the fourth and it is often the most expensive, because it stops the creator earning from competitors for the term.
A creator asked for broad rights and category exclusivity is being asked to give up future income, and the quote reflects that rather than the effort of making the post.
Why perpetual rights are usually a bad buy
Advertisers request perpetual use because it removes an administrative worry. It also inflates the fee for value that is rarely realised.
Most creator assets are unusable within a year, because formats change, the creator's own appearance and style move on, and the product is updated.
Buying twelve or eighteen months typically covers the whole useful life of the material at a fraction of the perpetual price.
The risk of using material after the term
Rights expire quietly. Nothing stops an asset continuing to run, and the usual discovery is a message from the creator months later.
The exposure is real, since the person's likeness is being used commercially without permission, and the resolution is a negotiation from a weak position.
The practical control is a calendar entry per asset, held by whoever manages the ad account rather than by whoever signed the contract.
What to negotiate instead of scope
An extension option agreed at the outset costs far less than renegotiating after the fact, because the creator's leverage is lower before the asset has proved itself.
Pricing the extension per additional period, rather than buying it up front, matches spend to assets that actually perform.
That structure also gives a reason to review which creator material is still running, which is the check that most accounts never perform.