Club machines were a much smaller part; sales were not a volume anywhere near the number of pub machines for obvious reasons.
BFG were of course the best at club machines, really, and had a small team who pretty much just did those. Global built most of their business on club machines for a long time. You might sell 100 to 500 of a particular model.
A lot of clubs were just conversions of AWP machines, and compensated in a similar way although (more often than not) with a lot more compensators for multiple streaks and other prizes.
The "quirks" you mention were more often than not put in on purpose, i.e. the machine has already decided your maximum win, and will just engineer a way to not let you exceed that. Non max-win controlled games would do it on a random chance, but of course, if you got a large win, the compensator tightens up and the machine will just take the money back eventually.....
I never coded one, personally, although (at Mazooma at least) most of the lads who did AWPs also did the occasional club machine.
If you never noticed, Club Pacman was just Crazy Fruits - BFG gave us the code for it and we cloned it....