Argh spam is annoying. For most of the sites I visit I subscribe to their RSS feeds, but the spam in the comments RSS feeds is too much. From now on, the second I get spam in a comments RSS I am deleting that feed. I'm so over spam.
Although that is great thing about RSS, getting spam from a site? Just remove that feed. And for main posts (not comments) there is no chance of spam. RSS can be cool, just don't let your site output spammy feeds...