Here are 4 possible reasons, the actual answer to your question Tim might be a combination of the 4 reasons or might be something else altogether:
1 - Mac make some really good sounding gear (MC500 mono's, 275 re-issue, even the 252 sounds good), but they also make some rough sounding gear too, like the 6500 and 6900 integrateds, and some of their tube amps. Having rough gear in your portfolio doesn't help when you're trying to sell the good gear (image / perception).
2 - styling isn't to everyone's tastes, it's almost military looking.
3 - Mac gear appeals more to the older generation and relies on 'nostalgia' to sell.
4 - People who frequent sites like audiogon are often in a constant state of flux with their systems and they're in here looking for the latest/greatest deals. Maybe Mac owners are just so damned satisfied with their gear and they're sitting at home listening to great music.
They are just possibilities to think about. I don't want to debate why I think the 6500 and 6900 don't sound very good.
Rooze
1 - Mac make some really good sounding gear (MC500 mono's, 275 re-issue, even the 252 sounds good), but they also make some rough sounding gear too, like the 6500 and 6900 integrateds, and some of their tube amps. Having rough gear in your portfolio doesn't help when you're trying to sell the good gear (image / perception).
2 - styling isn't to everyone's tastes, it's almost military looking.
3 - Mac gear appeals more to the older generation and relies on 'nostalgia' to sell.
4 - People who frequent sites like audiogon are often in a constant state of flux with their systems and they're in here looking for the latest/greatest deals. Maybe Mac owners are just so damned satisfied with their gear and they're sitting at home listening to great music.
They are just possibilities to think about. I don't want to debate why I think the 6500 and 6900 don't sound very good.
Rooze