I'm generally not sympathetic to people who complain when apps are only at the Mac Store and they can't try them out first.
However, after having been stung (or saved, depending on how you look at it) twice today with apps that when downloaded proved to be worthless, I must share that skepticism. I think this is short-sighted behavior by developers.
A note to MU: When you demand that I complete the star rating before my comment is posted, you do a disservice to me, readers, and the dev. How can I rate something I haven't tried for the reasons just explained? I'm using one star, but there should be a way of NOT rating it.