Second, you're trying to solve a different problem than rauth solves: we needed a library that provided for the practical, de facto implementation of OAuth 1.0/a and 2.0 as well as Ofly which allowed us to consume provider APIs. This is exactly what rauth does. It loosely wraps Requests, which means you get to basically use Requests that also happens to handle real-world OAuth providers as a consumer. I don't think it's really fair to call this "silly": it's clearly filled a hole in the ecosystem for some people.
If you want to consume an OAuth provider, rauth tries to give you a simple interface to do so with. It's almost as easy as using Requests. You might even say, it's OAuth for Humans. (Sorry, Kenneth. :)
Edit: to be clear, rauth is about pragmatic simplicity, about a clean API that's pleasant to work with. It's a client for OAuth modeled around the fact and philosophy of Requests. Vis-à-vis everything else I've seen, this is in pretty stark contrast to existing libraries.