Not sorry to say, I'm in the same boat as AkumaZeto.
If the person buying does not know a red DMM lead from the black I'd rather not sell. I know it will break, I know they will think its my fault. I barely have time to keep my own machines running and pull a 60/hr week job without having to drive across town to find a bad fuse.
And like AkumaZeto, I learned by paying cheap from Operators who had stuff sitting in a warehouse, or people with a decrepid old machine in a barn (even had one that had rotted squash dripping down the glass and sides once), and taking them home and working on the for weeks before they were playable. And the reason Operators sold them too me fairly cheap, they knew I was not coming back looking for support. $100 for a Genie? Sure thing, thank you, gone.
Thats how you develop the 'love' of the hobby IMHO. Thats why I am still doing it after 25 years.
When I do sell machines, it's to move something out of my collection to make room for something I like better. I like to see my machines going to a good home where they will be taken care of. I've sold two machines in the past year and both have nice happy owners.
If you are a total n00b and do not want to learn or expect someone to fix any problems for you, buy from someone who is offering a warranty. Don't buy a value pin and expect premium service.