iOS 6 without dev account?

There are ways to do it on the web, but it's illegal (obtaining the .ipsw without being a developer [which requires paying 100 bucks] is considered piracy). You're better of waiting for the final release as the betas are intended for devs and dev devices only to test apps, no matter how stable they may be. Plus, Apple does not service devices messed up from a beta. You're better of staying on 5.1.1 which will net you the best performance and battery life till 6.0 is released.

Again, there are ways to do it, but it's not suggested to be on the safe side (if you rely heavily on your device, care about battery life, etc).

 

Well unfortunately being a dev in the past doesn't give you a free pass for betas after your account expires.

Again, if you're really wanting to do it, a quick Google search would tell you how.

http://bit.ly/R3XoMZ