So it is beyond a shadow of a doubt that the government is responsible for defining who is a sophisticated investor?
yes, there is legal definition for that. Unfortunately for a person it boils down to be being rich:
http://www.sec.gov/answers/accred.htm I question if there is a clear definition of what constitutes a security that government assumed the authority to regulate.
Then read the securities act, its pretty damn clear these are securities. Game credits typically would not constitute a future contract, company share or profit sharing agreement, and therefore wouldnt be securities even if they are sold on ebay for real money. That bitcoin securities are traded for bitcoins rather than dollar is irrelevant, they are traded for "value". This has been explained a gazillion times on this forum.