You aren't paying $99 JUST for iOS software... You are paying to be a developer, to be able to publish Apps to the App store.
If you seriously want the software, just have your UDID registered through somewhere for a few bucks.
BUT its a beta software, if you don't know your way around basic restoring / updating processes, you will be very disappointed with the polish in a beta software. Customers should always wait for the free official update, its a better experience over all.
Probably should wait, but honestly my iPhone 5 is already buggy enough. The ios7 beta may actually help me haha.