bostonpinball is way off in my opinion on many pins. Average price for TAF and TZ is $3500? Whitewater $2100? These are averages over what period of time? That means for every TAF sold for $4500 (which I would say is typical as I don't see many at all selling for less than this) there is one that sold, on eBay no less, for $2,500! Just about every TAF that I see listed on eBay is for well over $5000. Maybe part sales are included in the bostonpinball averages :> I'd love to know where these machines are selling. I'd rent a storage unit.
That being said, I wouldn't base a selling price on bostonpinball "data".