Whether you buy new in box or buy a game off craigslist, sooner or later (probably sooner) it will need repair.
OP got his money back on first one. In the end i see that as a wash .
The coin mech, well it should all work out of the box but things dont always go well. It is a complicated machine that was shipped.
The distributor should open them and test them but what about those box opening parties.
You will either need to learn fix at least the small stuff or put the local service guy on speed dial.

If i am disappointed with some product or company, i generally dont go right back and try them again. But thats just me.