I work on most of my games, but I have to admit that I get nervous after putting a bunch of time and money into working on boards and then turning it on. Will it work? Will another transistor blow up? Will I be able to fix it? Or will I have to have someone else fix it? Just got a WWF working after owning it for 2 years. Put in a bad power supply and it did some major damage. This had to be taken care of by a professional. Meaning more cash. I'm not as worried about people playing them as I am about electrical stuff going haywire. Mechanical stuff is no problem, but the board stuff can drive me crazy! I always am thinking, every time I remove a connector it is taking some life off that connector and the pins. Just got a new solder sucker and it is making a huge difference on working on the boards.
I cringe at the thought of someone machine gunning the flippers, but I really worry about replacing an IC chip that I don't know how to track down or test.
By the way Rob Anthony (locked when lit) does nice work.