I have a theory that it's actually shipping costs that are driving up the price of pinballs - nothing to do with new/dumb/desperate people- everyone wants to "break even" on a game so you may buy a game for $2K spend $3-500 shipping and BOOM now you want $23-2500 for your game when you sell it.
Check out uship.com I moved a game from KY to GA for <$250 including uship's fees. Seller was able to prep for shipment but based on how I've seen STI ship games I'm sure you could give 1-2 sentences of instructions in a uship description and do the same. "Put 1 blanket between the backbox and glass." "Wrap the game in moving blankets, now wrap the game in Saran Wrap, leave the legs on and bring it to me." BOOM that's how STI does it.
My game got delivered less than 16 hours after pickup - STI took over 2 weeks @ almost twice the price.
Would I use either service to deliver a $15K HEP pin - NO! But to ship a $2-3K players grade pin - sure. Do some research on the shipper and get a copy of their insurance policy before shipping then call and verify coverage.