From watching the market I learned several things:
Probat (German) and Diedrich (American) machines sold for the most and sold quicker than other models.
I knew it would be hard to get one of these, but at the same time in the future we could sell it higher and more quickly.
Others like San Franciscan, etc. also appeared but didn't sell quite as fast and didn't have the positive feedback in forums which Probat or Diedrich commanded.
Nice 5-7kg (10-15lb) used roasters were selling for $10-16,000 USD.
Larger 10-12kg (22-30lb) used roasters were selling for $18 - 22,000 USD.
Much older, classic cast iron drum roasters (typically 10-12kg) sold immediately for $20,000+.