As someone who "restores" pinball machines for other people.... interesting post.
I think the issues here revolve more around peoples definition of words like "professional" or "restoration"
To me, someone who is a professional at something, is someone who earns their living doing that task..... Professional Football players, earn their living playing football. Professional auto body painters, make a living painting cars etc.
I don't know how many actual "professional" Pinball restorers there are in this Country. Very very few I'm sure. HEP, would be one & there are probably a few others that I am not familiar with.
Most people (including myself) are more Hobbyists, who work on peoples games for entertainment & to make a few bucks on the side. I work at a Car Dealership to put food on my table, & a roof over my head. I don't rely on restoring pinball machines to do it. Any $ I make from pinball work goes back into my pinball hobby... upgrading equipment/facilities or buying parts for my own machines etc.
Hobbyists are going to have a wide variety of levels of quality, due to experience, equipment, materials used etc.
Anyone paying a hobbyist to do a job for them should look at level of work performed in the past by that person & decide for themselves whether they are comfortable with the level of work to be performed, as well as timeframe etc.
Then we come into the whole "restoration" word.
A "restored" machine is going to have different meanings to different people... My general definition is a machine that has had everything re-done..... cab, backbox, wiring, boards, PF, mechs etc. I (& I assume most others) don't consider a Cab painted machine with a new PF swap a "restored" machine. It's more of a partially restored machine. So to see connectors not done, & display board untouched etc.... that's what it is... a partially restored machine.
Most of this is just semantics over the definition of words.
Cabinets do take a tremendous of time to "restore" very nicely. Some people cut corners & they don't end up as nice..... I suspect those guys are spending way less time. Time = $. Time "usually" = quality.
I used to quote a cabinet paint job at $600 + stencils. With cost of paint/clear/primer/sandpaper/filler etc rising as it has in past years, I could not even conceive of doing one for less than $800 now in labor & materials (not including stencils)
I hav'nt had anyone want just a cab done in a long time, it's all full restos now.
I charge $2000 in labor only to do a base "restore" a game (parts are all extra). I make about $10 a hour labor.... but it gives me a hobby in the evenings & weekends that I enjoy. & I will be bumping my labor up some more in future.
I charge a little more if guys wants a new bottom made for cab etc. But the base game resto is $2K & I have been told by many that I'm way too cheap. Probably why I'm booked through mid 2023 at this point with games. But again, I don't do it to make a living, I'm just a home hobbyist. Obviously I could not live on $10 an hour.... hence why true professionals at this are charging 3X+ what I do.
Whenever $ is involved people are always going to get up in arms, especially if the quality of the work is questioned by the end user.
If I had a customer question my work when I was done & pointed out all the flaws they were upset with, I would probably cut them a break on the cost. But I just try to be upfront with guys & let them know I am not a professional...... if you want professional quality, hire HEP. If you want close to professional quality & can wait a year & pay less, there are probably several hobbyists around that can do it.