Probably best to just keep your mouth shut about it. It may turn out to be nothing. Unfortunately Part 91 jobs can be like that. Your quality of life all depends on the owner. I think the best jobs around are working for a good 91 operation/owner. The worst flying jobs are working for a bad Part 91 operation/owner.
Many uninformed owners always see $$$ and think pilots are all the same. They don't understand that what you pay for is what you get in pilots (usually true). Pilot's being the most important (and cheapest) factor between safe flights and ending up dead.
Charge what you are worth. If they aren't going to pay it, they aren't worth working for. It also helps establish the standard for pilot compensation.
Please don't undercut what you are worth and if they do find someone else to do it cheaper, let the pilot world know that you were undercut by so and so. Aviation is a small world.
I have shopped for contract pilots in the past for a small jet. Some will come back saying they will do it for free or only $200/day. I won't even consider them when the going rate for a small jet pilot is $500+/day. It is a punch in the face to the profession to do so.