Great project. How do you make sure the other blogs give people who've paid $1 feedback?
To build on that, for most of these blogs this is the first time they're earning any mentionable revenue from running their websites. Not only is it making their lives easier -- it's actually rewarding them for their passion yada yada.
So, you monetized websites that previously weren't with product their users will enjoy. Sounds like a nice design pattern for bootstrapping businesses on non-profit organizations or sites. One to remembet. I especially like you keep it win/win.