It costs the broker next to nothing to run with an item. If it sells, great, if not, no big deal. Having a hundred types of hooker wear for V4 is of no issue to the broker, it's competition between the vendors.

Vendors (content creators) make what they want to make.

The only place a broker MIGHT have is to put out some information occasionally about what they have in store and potential shortfalls. For example, some normal daywear for M4 that doesn't look like he has balloons for shoulders. It would then be up to the content creators to fill that gap IF THEY WANT TO. No guarantee of sales, no commissions, just a sales point saying it was an area that was open for more material.