A test takes like 2 minutes and repair on a new device usually involves nothing more than cleaning the pipe glue or other debris out of it, maybe another 2 minutes depending on the valve type. Why would anyone who has gone through all the trouble to get a BPAT cert lie to save themselves 5 minutes? Seems pointless to me.
I only got my BPAT so I could test for myself. I don't install much (unless it's a replacement) but what I do install I test to save time and money, not to game the system. Hell, I don't even charge the customer extra for the test, I just do it because it should be done.