I did a split season (Saturday and Sunday games only) of major league baseball. My thought was basically the same as yours, sell enough of the tickets to recoup the cost. I had a really hard time selling any of them that weren't prime games (Yankees, Red Sox). I did enjoy going to the games and the tickets were cheap. Every year I think about doing it again. I never do, though. Now I just pick a couple of games a year... it makes the experience a bit more memorable.
You need to remember that for every Hawks-Cavs game, there are Hawks-Knicks, Hawks-76ers, Hawks-Jazz games that are going to be VERY difficult to move.