I thought exclusive, in that regard, meant that you only sell at that store, as in, being an exclusive vendor to that store.

It seems kind of silly to sell the same item at multiple stores. Kind of competing with yourself in that regard, if the commission rates are different from one to the next. 

I know other stores do require exclusive vendoring in order to get the higher commission rates. I think squid is one, (not 100% sure though).