In addition, due to risk of bed bugs/contaminants and the fact that people are very particular about the comfort level of a mattress, the re-sell market for mat

In addition, due to risk of bed bugs/contaminants and the fact that people are very particular about the comfort level of a mattress, the re-sell market for mattress is really unlike other pieces of furniture. Whenever I've moved, I've really only been able to sell mattresses to people who trust me because I can vouch for living in bed bug free zone. Otherwise, I've just had to trash it because as you mentioned, it's way too cumbersome to transport. That's kind of why certain furniture brands catered to urban markets (smaller dwelling) tend to make some of furniture able to be dis-assembled: much easier for moving around.