Polish is nice to have, sure, but if nobody wants to actually play the delivered experience, all the polish in the world won't save it. Nobody should buy a game just because it's polished. While I'd prefer polish on all my games, I'll take an unpolished dwarf fortress over a polished forgettable uncompelling game any day of the week).
As a side note, I'm not sure what rule I've broken to get downvoted. I pointed out that there could be more to this story, and that we don't have solid data on how many trial downloads there were (which is a MUCH better indicator than sales is regarding "marketing" in this case).
For those unfamiliar with XBLA, just about everyone downloads a trial first (every game on XBLA is required to have a free trial, so you'd have to be pretty impulsive to skip it completely), and then you can buy the game from within the trial version's interface.
If the point of the comments here on HN is to add to the discussion, I'm not really sure what I did to justify a downvote. I'm just getting started commenting here and don't really have karma to spare. I really try hard to be a positive member of the site, so If somebody sees this and can point out what I can avoid doing in the future, that'd be appreciated.
(I don't mean you should have bought the game. All I say is I don't understand why it didn't generate more sales in the indie community.)