So there is a "Can create products" permission that can be applied globally or per category, so ...kinda?
The problem is that it is not possible to make it so that the person selling the item receives the money in their PayPal account, and then the forum gets a small percentage of that.
First of all, this mod supports all XF2's payment processors (and third party added processors), and you can't restrict each individual item to specific payment processors, because of the shopping cart system. If you have 2 items in cart, and item A can only use processor X, and item B can only use processor Y, then you have a UI/UX nightmare trying to get the buyer to pay in 2 separate transactions to 2 different payment processors.
It's just not possible.
Secondly, even if we did restrict it to PayPal only, it would require PayPal reviewing the application and getting an API key, which is not something I'm going to go through every time I want to release a new version.
In other words: You want a Classifieds mod, and you want a Classifieds mod that supports automatic payment splitting so you can get a part of the proceeds automatically. Those things are outside of the scope of this mod.
Fillip