I have heard that cheaper products sell better, because they lead people to not think so much about the price. This leads to many impulse buys. The thing is I believe it is just as hard to sell a cheap product than a more expensive one.
If I work hard to promote a product I want to be paid as much as possible. However, if I can get a small sale and then upsell later I do not mind doing this either. I guess what I am asking is who has done both? Which one were you more successful at?