Not necessarily. The important thing is that the demand curve slopes down but doesn't go to 0 that quickly. With Amazon you have the entire US (and other count

Not necessarily. The important thing is that the demand curve slopes down but doesn't go to 0 that quickly. With Amazon you have the entire US (and other countries) as potential buyers and for popular items there will often be some buyers. Also, you don't need much appreciation to make money. If MSRP is $50 and you get $80, and paid $35 wholesale you still make a good return after fees. I just picked this one out because it went up a ton, plenty of others go up less but are still good.