It would at least make sense to part the pin out if you were going to make more money, but I am guessing the seller is going to lose more money by parting this pin compared to just selling it as it was. Overall it looked like a nice looking Flash. If it was close to me I would have happily paid $400-500 for it, it would have taken me a lazy weekend to get it working well, but I would have had a pretty nice Flash when I was done.
By parting it out how much could you hope to make? Lose 10% to ebay fees. Most of the parts are just not going to sell or they will sell for a couple of dollars. So you are left with the boards, the backglass which you won't ship so it will be hard sell, some used playfield plastics. Sadly, your nice cabinet will probably go in the trash. Most of the parts that I replace on a pin I don't want used ones(used flipper assemblies?) and the other parts don't go bad (I have not had many drop target assemblies go break, maybe a coil or target, but I am not buying them used).
I can't get over the time it will take. Figure at least one hour per part to remove it, take a photo, list it, deal with possible buyers, wrap it, and ship it. I don't mind working for free when I am doing something I enjoy, but I would classify parting out a pin that I have become angry at as "work" and would want to earn a decent hourly rate for that job. Having to wait around for a buyer, possibly months relisting the parts, dealing with questions, what a pain.