I also know the buyer. He is a very serious, legit and nice guy, and is paying a very fair, if not above market price, for the collection.
I've also bought a machine from Neo, know him a little, and trust him too, but I think a $5K non-refundable deposit is very fair with the balance on delivery given the time delay in delivering the games.
You guys should make the deal since Neo is too far way for me to play this awesome collection, and the buyer is close enough for me to come by and play some of the Zac's I've never seen before!