I don't think the forum should be too concerned. It wasn't that long ago that Bitcoin itself was being called money laundering. At most, I'd guess the forum could get some formal legal request to ban or remove certain things from the site and/or maybe banning any participants that continue to advertise for a particular service which has been deemed illegal by the country the forum is hosted at, but I wouldn't see the forum itself in any big risk, as theymos would probably comply if it is related to advertising. That said, I'm not a lawyer.

So does this mean those minted coins you sell don't really belong to the "fans" that buy them? 

They are "your" keys after all, you did create them.. and you seem to have no regrets using private keys for personal gain simply because you created them.. so, based on your logic here, it may be time to sweep my coin and melt the silver.