Hey, I conducted my own test over here...
Turns out 100% of the songs I ripped from CDs can be shared wirelessly with other Zunes... Go figure.
Seriously, I find people who spend their hard-earned money on music that isn't guaranteed to be playable on their next device to be just plain silly. Or very short-sighted. Or happy sticking with the same company for the foreseeable future (e.g. iPod + iTunes). Either way, you pay for DRM-restricted music, you get DRM-restricted music. No two ways about it.
Don't want restricted music? Don't buy it.