Gittip is designed to grow slowly and shrink slowly. It's designed to be relatively stable over the long term so that you can depend on it to pay your bills. There are three ways for "unknown" developers to receive significant money on Gittip:
1) When a famous developer accepts tips despite the fact that they don't need them, and then regifts them to "unknown" developers that are known to them, perhaps as the people behind the scenes on the projects they're famous for.
2) When you set up an (opaque) project account such as ReadTheDocs has done: https://www.gittip.com/readthedocs/. ReadTheDocs can split that under the hood however they want.
3) When you set up a (transparent) team account and everyone on the team gets to take some of the money given to the team. This is a relatively new feature, see: https://medium.com/building-gittip/eba0a27825b8.
Again, though, funding will always grow slowly. Gittip is for the long term.