Quoted from ralphwiggum:
I am not sure how anyone gets a free pass selling on here and not expected to be called to the table for no pics and never plugging it in. The amount of time it takes to plug in a machine and snap a few pics isn't much longer than it takes to post a for sale post saying you have a machine for sale, which he did (twice it looks like, with a price increase between postings).
You don't know the story behind it. For all you know he bought it from a customer that had it sitting for 10 years. While many a hobbyist would simply take the chance and plug it in, if you're running a for profit business you probably wouldn't take the risk. If a game sits, it could have bad bridge rectifiers, it could have battery acid damage, it could have something plugged back in wrong. To really evaluate a game the right thing to do is unplug every board and boot with just the transformer, but again this is invested time.. and by the sounds of it he has a lot of projects and just wanted to sell this as-is.