Pass labs x260.8 versus xa160.8

What we don't know, and what Pass is unlikely to share with anyone, is just how many of each model has been sold in the marketplace. How many units are sold new often dictates how many are available on the used market more than buyers being satisfied or not.   

Also note that the Xa160.8 is a pure class A amp while the X260.8 is an AB unit. It could well be that, if one buys fully into the Pass philosphy, that a class A unit is the greater preference of buyers.   

So, there is a lot we don't know which means that our speculations are little more than naval gazing.

Your original posted centered about the question of why there were so many more used listings of one model versus the other.  

The thing to keep in mind is that while one person's individual experience will tell you about their personal experience (which can be informative on its own), it indicates very little one way or the other about the overall pattern of why there are more used models for sale of one model versus the other.  Pass could provide some insight on the issue, but that's unlikely as those type of sales figures are often considered confidential business info by the company, especially by businesses that are privately held.  That was my only point.