The lack of any product for sale on Audiogon can be due to a number of reasons that may or may nor have anything to do with quality of a product or its popularity.
An item may sell only a handful of units in a given year, making the pool of available used units very small. Also, some products are sold primarily through word of mouth or through non-internet channels. Doshi preamps are an example that come immediately to mind.
Also, owners of a given item might not be frequent users of Audiogon. For example, I can think of certain manufacturers that have a much more avid following on AudioCircle, and therefore used examples of their products will be found more often on AudioCircle.
An item may sell only a handful of units in a given year, making the pool of available used units very small. Also, some products are sold primarily through word of mouth or through non-internet channels. Doshi preamps are an example that come immediately to mind.
Also, owners of a given item might not be frequent users of Audiogon. For example, I can think of certain manufacturers that have a much more avid following on AudioCircle, and therefore used examples of their products will be found more often on AudioCircle.