Yes insaNity, but betas usually give a taste of whether a final version is any good or not - and usually by beta stage of development the core systems and interface have been mapped out and usually does not change too much when you move to the final version. In many cases anyway.
The best example is from when Winamp 2.x and 1.x was in beta stages.. I never remember reading anything about memory leaks, and back in Win98 / 95 it was stable for the most part.
Most people here aren't cirtitally compalaining about the beta as it is a beta but topics like this are important to point out bugs that other people could face.
IMO, I don't like the new Winamp 3 as it is more of a "done for looks" version of Winamp - I prefer the older 2.78 version which works well with the plugins I have and doesn't steal resources like 3, which I have also tried on my system 🙂