Quoted from ryanwanger:
I think it would involve figuring out a machine or range of machines they are interested in, finding the machine, and doing delivery/setup. Maybe in some ways, it would be like being a realtor for people buying pinball machines. Is there anyone out there who would want to provide this as a service? I think you could make a little bit of money on the side doing this for newbies and charging by the hour.
There is definitely a broker market out there, for new and for seasoned collectors.
A retailer is likely the best best option for newbies who aren't sure what's out there, how to tell if a deal is worth while and how to understand the basics of maintaining a game, so it's worth ponying up some extra money for the help, advice, possible transport, on top of finding their ideal game, and perhaps service later on. An individual could certainly do all that as well, but tend to be less reliable.
I had a neighbor willing to buy a Kings & Queens if I ever ran across one (still haven't to this day). It would have been worth it to both of us if I happened to find one, transport it, fix it up a bit, helped him install it, and tacked on $200 for the time, gas, and parts (we can argue separately if that even covers it). Broker is a better description for this than the term we are more familiar with (Flipper).
I have also talked to plenty of seasoned collectors that would gladly offer a finder's fee (aka broker fee) if someone could locate and secure a tough to find game for them in X condition, at Y cost, etc.
In other words, knowledge and connections can definitely bring value if someone wanted to do this... and let's face it, there are more people already doing that than we all realize, but outside of retailers, most do it in a more hidden way. New owners are a benefit to everyone in the hobby.