Probably echoing things that have been said here and can found elsewhere.
Nothing wrong with just wanting to plug and play, which is why many people choose new games.
However, there is a misconception that NIB or fully restored means perfect. A little research shows numerous threads about how to tweak, modify or dial in a brand new game to make it play better. That is irony.
An alternate strategy is to buy games from collectors who have done the leg work to get the games playing awesome. This can be with a new game or even a game that 10, 20, 30, 40+ years old. For example, a lot of the EMS seem to bullet proof once they are gone through and working correctly. It is amazing how much of a workhorse some EMs are.
Some basic maintenance on games will always be required. A rubber will eventually break, a bulb burn out, ball needs replaced etc. Now unless you are a “It’s time for a new car when the change oil light comes on” type of person, any machine needs a little TLC.
The trick is to find games that are known to be more reliable without hyper-finicky gadgets. By default they all have moving parts, but none should be so delicate that they need constant adjustment. I don’t want to recommend games, or manufacturers, but with time, reading, playing numerous games, talking with friends, one can start to see what titles, brands and types of games are more reliable.
Anyway, long story short, it sounds like the hobby would be more enjoyable to you if you could just spend the money, didn’t have to mess with stuff as much and could just play. So, ditch the problem games and keep the ones that play more consistently and reliably. But keep in mind they will need some love, some day.
Enjoy, and remember pinball IS fun!