People complain about how buggy iOS8 is, I can't imagine wanting to install a beta that could be even buggier on my phone. I need my phone to be operational, and while its cool to see what apple will be doing next, rolling the dice on a beta software just doesn't do it for me.
The poll results (at least as of right now) are comical and very puzzling! All of the iOS-related forums are full of hatred and venom because of alleged bugs, lag, etc., and yet a large majority is going to install the beta immediately after it becomes available???
Difference is that currently iOS 8 is a Final Release. If I wanted to revert an older device from iOS 8 to 7 it would be impossible. I'd expect the amount of bugs iOS 8 has now in a Beta 4 release, not a Final Release. Apple screwed it up and that's why people (me included) compain. I want to be in the Beta program to help produce more bug reports so another iOS 8 doesn't wide up in our Settings app bugging us to upgrade.