aibodax wrote:What about SecondLife?
I know some sites don't allow tradeing with it, since you can exxhange L$ (SecondLife's money) into USD.
http://secondlife.com/corporate/tos.php#tos5
5.3 There are other Linden dollar exchanges that are operated by third parties.
Linden dollars are occasionally Bought and Sold on third party exchanges, which are wholly distinct from the LindeX exchange. Unless specified by Linden Lab, these exchanges have no affiliation with Linden Lab. We do not guarantee the legitimacy of the Linden dollar transfers offered on them, and we are not liable for purchases of such Linden dollars. You purchase Linden dollars from such sites at your own risk. If you Buy Linden dollars that are traced to unauthorized credit card activity or other fraudulent activity, we will recoup these Linden dollars from your Account.
Purely for informational purposes, we may list on our Websites third-party exchanges that use our "Risk API" tool. The use of the Risk API may lessen the occurrence of fraud on those exchanges; however, in no event do we endorse, guarantee or insure your purchases from these unaffiliated exchanges.
I can't find anything saying that you can't trade offsite. If there is something in there, I didn't catch it (so wait for Sorren to say).
While we're on the subject of Virtual Chat worlds, IMVU.
IMVU may allow for free exchange of some, all, or none of its Credits via third parties, but IMVU does not assume any responsibility associated with your transactions with such third parties. IMVU is the sole owner of Credits, and as such, retains all intellectual property rights affiliated with ownership. You acknowledge that at no time do you own, nor have any right to, the intellectual property affiliated with Credits. You are hereby prohibited from reselling or distributing Credits without the expressed written consent of IMVU.
To me, that is saying we're allowed to trade offsite, and at the same time we're not.

Italicized says we are. Bolded says we're not.