From seller’s point of view it doesn’t sound very appealing.
I would understand if a seller gets a base fee and a bonus from every sale, but spending hours or days on trying to sell something and if the product sucks then you won’t get paid. I’m not saying it does, but the seller you hire really has to believe in your product to agree to this.
You write blog posts. So would you accept a job where the clients say “Write me a blog post about my product and if I make sales you’ll get paid”?
That being said, there’s a seller for every buyer, so if you look hard enough you might find a seller.
I wish you the best of luck.
All I’m saying is that if you change your payment model then it will be more likely to get a good seller.