Hi Greatballzofire!
I've done that too, but my concern is that our neighbors (and I, on occasion) spray their lawns, and so I have been worried about pesticides, herbicides, etc. What I'd like to do is start a culture and raise them myself so I know they're clean... In my youth, I always fed a range of wild-caught insects, isopods, etc., and I never had a problem with MBD, etc.
Cheers!
Greg