Les, you're right: People generally set out to do a bad job on purpose.
Not sure I understand, Sam. I wasn't suggesting that people set out to do a bad job. Seems there was some misunderstanding of my question. I'll try again, in case there was.
The sound engineer gets a feed from your bass. He/she has to listen to that feed and place it properly in the mix. I simply didn't see how knowing that the feed comes from an SM-57 (or any other specific mic) helps the engineer to do meaningfully better.
I do understand that, if the mic is a standard and known quantity, then it says to the sound engineer that a poor result can't be blamed on the transducer. If the engineer is lazy and just doesn't care, then seeing the SM-57 might spark him/her to rise to the occasion and get it right knowing that no one will buy that he was fed a poor signal. For the sound engineer who is competent and cares, then I'd think it wouldn't make much difference what transducer is in use, so long as it's of good quality.