Yet another reseller store

Chain Allen has reported that there are at least 20 reseller stores selling my products. He sent me a landmark to one of them. Apparently there is a sort of ring of stores that keep buying products off of each other and growing their inventory to become mega wholesale warehouses. I have been trying to get these owners to take my products down, but new stores appear to spring up that I haven’t heard of. Should I just give up on the whole issue? Is it really worth my time?