Gittip is certainly going to help more popular coders at first. But that's true with any platform in its early growth phase.
When Gittip is more well-established, anyone who wants to should be able to put a "Gittip button" on their project page. When Gittip itself has more name recognition, an unknown coder who creates a widely-used project should be able to rapidly pick up meaningful support through Gittip.
Not only that, Gittip's project pages allow funds to be distributed to the entire team. So even if you're not well-known, if your project is, you can still get some.
When Gittip is more well-established, anyone who wants to should be able to put a "Gittip button" on their project page. When Gittip itself has more name recognition, an unknown coder who creates a widely-used project should be able to rapidly pick up meaningful support through Gittip.