Process is open, only a couple $1000 to certify the device. Actually, as far as I know, VZ doesn't require any fees to certify the devices, and the process is all self certify (fill out the paper work with various statistics, sign it, mail it to VZ). The only problem is the AGPS accuracy test requires a trip to VZW's headquarters in NJ for a baseline GPS position.
Now the reason nobody wants to jump at the opportunity is, because VZ doesn't guarantee any rate plans or their features or their price. So you don't want to release a device that will get a sticker shock price increase on its plan, or you can't profit from the monthly fees for the device, or get the device subsidy that the user created by signing a contract with VZ (VZ takes the subsidy).
So thats why nobody is releasing any consumer devices.