Having two spam filters on your blog is enough to manage – sweeping out the leaks just makes it more of a pain in the ass. But one must remember that a lot of this problem is inherent in the communal nature of blogs themselves – the abiliity to comment and link to them. Google’s inbound link-based algorithms cannot be held solely to blame – this was never anticipated when they started their quest.
As Tom Hespos so accurately points out, when the rewards associated with blogging are pilfered by the rats (the spam blogs), those driving the process ( legitimate bloggers) will move onto other things.
What if the reward was stripped from the spam blogs?