No stores in my opinion, if you don't work to get something, you don't really appreciate it either.
Seeing as Blizzard aims to use in game gold as the main currency, I doubt there will be much item trading and the need for sites as d2jsp etc. However, goldfarming and gold selling sites will most likely be a fact a few months after release, and unless they find an effective way of eliminating/punishing these offenses, some people will always "cheat" their way to the top, but that's their loss.
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Seeing as Blizzard aims to use in game gold as the main currency, I doubt there will be much item trading and the need for sites as d2jsp etc. However, goldfarming and gold selling sites will most likely be a fact a few months after release, and unless they find an effective way of eliminating/punishing these offenses, some people will always "cheat" their way to the top, but that's their loss.