Worth of bitcoin ATM machines

How would you value used bitcoin atms being resold as new and as used?
Specifically im looking at buying some used BATMThree machines.
E.G. for used typical hardware the price is reduced by half (not gpus or miners). When i had an ATM custom made it cost me around 3k usd for new but these are selling for 6k as a starting point.

Anyone with firsthand experience on these machines?
Does the software charge any commission for transactions?