The RSS feed is limited to 10 items because people like to set their refresh rates to 1-5 minutes.
The beta site will have a more customizable RSS feed that can let you specify how many entries are returned at a time.
I fail to understand the logic behind this action. Limiting the feed to such a small number of items only forces people to refresh MORE often. I used to update every 2 hours, but now I have to set it to something abusive like 10 minutes or else I'll miss a lot of them. This is completely absurd. Can't you see you are only making it worse?!