That's a shame.
Shops have been busted for doing this kind of stuff, and it happens frequently enough that they should be paying attention.
Doing it as a hobby and getting a hand slapped might be fine for an individual
Doing it as a professional where one might have a GROL ticket, multiple other LMR licenses, the reputation as a good shop, and some level of pride in ones work should flash some warning signs. Taking pride in ones profession is something that many don't have, and all they see is dollar signs.
For some of us, integrity is important and something we value. Some, not so much.