Bugs are still being fixed. The svn is open now.. I've done a few for the next build, rojo's done quite a few in the past few builds, and of course ashley has as well.
I can't speak for the devs, but I guess that implementing a pay for bugfix system wouldn't be feasible, since it would have to be implemented on the site, and then watched over, money split with nonofficial devs, etc. Resentment building for paid for but unfixed bugs, etc.
I will say this though, it being on the bug tracker makes all the difference as to whether it ever gets fixed. Whenever I get the urge to fix some bugs, I go straight to the tracker, as I suspect the others do as well. If its just left in some random thread on the board, there's a good chance it'll never get looked into.