A couple of weeks ago, I was in my motel room near our dive site while divers in our group were outside getting ready for the next day's diving. One of them came to my door and showed me a DIN plug with a pressure release valve and asked me if it was mine. It was. He said some of the others said it could not be mine, because I would not be willing to spend that much money on a DIN plug. Apparently I have a reputation for being a bit cost conscious.
It did not occur to those joking about my cheapness that they were filling their tanks out of my dedicated scuba van, using my $7,000 booster, my $600 fill whip, my $800 trimix analyzer, and other related gear, none of which they had to buy themselves because I supply it. They were getting the helium and oxygen out of the supply bottles I brought. I do charge them roughly my cost for that, though.
Well, we all look for ways to save money. For me, I buy the things I have to buy, and I look for other ways to save a dollar here and a dollar there.