Hi, I like to make controversial statement. I don't think google can penalize spam links to your money site, unless they are 100% sure it is from a paid source (like BMR..). Why? imagine this scenario, happens a lot. Someone drops a link at your blog or your forum, and blasts it away with all they got. Would your site be penalized? If I can figure out this scenario, I am sure google can too. So I think they would simply discount those links. Their algo has to establish a under-the-table relationship before they can penalize.