As justa artist on the sidelines and not even a creator of models and textures or anything like that my opinion after reading all this as one option since it's all overwhelming/ time consumming/non-profitable and unethical as to the problems at hand would be for creators to beat the copycats at their own game and instead Join SL/IMMU besides Poser community too.
Therefore each would have the jump on any copycat in that each creator would be marketing their OWN products in both versions to sell...making more money themself plus detouring anyone from marketing what is already posted by said creators.
I see it like this...If this has all been going on so long and the Top Stores..DAZ/SL/IMMU haven't stepped up to the plate and protected their selling patrons already in these areas from the getgo it's bound to go on eons more before any and everything is addressed with ironclad laws all around (which is also almost non-existant as long as people are involved making money for whatever reasons) to help the Actual creators in the here and now.  It's all about greed for the most part...always has been and always will be due to a poor immoral world we live in.
Interesting topic.