As I have done with prior posts by Skip (too-many-pins), I will vouch for him being a great seller and asset to the community. I purchased my 3rd and 4th machines from him many years ago (by this time I have had ~50 machines come in and out of my collection).
He was upfront with the machines condition, I was not surprised when I showed up to buy them, and they worked great for a long time after I bought them (I am still sad I let the Mousin' Around go that he sold me).
I saw two of his "junk machine" storage rooms many years ago. Skip was trying to save and keep of out of the dump a pile of pins with salvageable parts. He was having to pay real money each month for those storage rooms, these junk pins were not being kept in barn on the back 40 at no cost to him.
Skip makes available many hard to find parts from the machines he parts out. He has helped me out when I get project pins with critical parts missing. He is not like some part hoarders who have piles of stuff around but never put any of it back into circulation.
Buy with confidence and be understanding of Skip's situation.