As the founder of MoDevRI and a mobile developer myself, I like the idea, but that's a serious investment in hardware and wireless fees. You'd have to be absolutely sure that you'd have enough people using it monthly.

I like what Mob4Hire does; they crowdsource testers with a wide variety of devices, and then a developer can launch a test to any variety of users.

Freelance mobile architect with a bunch of apps developed (some ported from iOS, some original).

http://twitter.com/ggrell

http://gyurigrell.com  -- Personal blog

http://trickybits.com -- Apps business