Assuming there are ~ 600 items (I stopped counting at 300) I don't really think the average price per unit is unreasonable at ~ $60.00. His real problem is asking $35K at once.
If he parted everything out he might actually hit his asking price, but any serious collector who's willing to throw that kind of money at an auction is looking to 1) resell (not really a good option at $60 per unit) or 2) pick up a gold Wold Championship cart.
If someone was to resell everything I would guess that they could net ~$5000 but it would take a LOT of time and effort...like a year of playing the ebay market.
It actually has me questioning the insurance rider I have for my game collection...might need to bump it a tad