http://www.slcapex.com/It doesnt matter one iota that you can redeem lindens for usd anywhere else. Just as a GLBSE "game token" it wouldnt matter if you use bitcoins somewhere else if you use the same TOS.
What DnT said. Im not too familiar with SL and I havent read what you linked; but while you can put anything in your TOS, that doesnt mean it will stand up in court when challenged. Calling something a game and using a token as proxy for money doesnt magically make it legal if the token has actual market value If it were, you'd have no legal problems opening a casino or play poker games for "tokens" ie, poker chips, instead of money.
Try it, and see what happens.
Exactly.