Pari,
I don't think that it IS obvious that EA will provide the only secure sales of simoleans. As long as EA promotes this line then it will backfire, like the anti-drug campaigns that were over-the-top. People find out the truth and then they laugh, toss out and disregard even the honest bits.
Yes, there are scammers. However, the majority of power sellers maintained top sales reputations. That is what made (makes) them a force to be reckoned with.
Personally, I'd like to see all simolean sales stopped. Yeah, I know that ain't gonna happen. But, if EA is gonna succeed at winning the biggest share of the simolean sales market, they need to compete, and not rely on painting the competition with a broad (and inaccurate) brush.