Hmm. This sounds like it may work but we haven't tested it out yet.
Since the paid apps problem in Android Dev Phones was only semi-solved with the 1.1 update to Dev Phones, it looks like HTC has delivered a solution that'll allow Dev Phone users to access the paid applications. Over at HTC's website, it shows detailed instructions on how to flash a Factory System Image onto the Dev Phone. We'd imagine that the Factory System Image would allow you to access the paid apps then?
The instructions are located HERE.
If this makes sense to anybody, feel free to educate the rest of us in the comments!