Major/Minor Dilemma

I finished "Shadows Of Venice" last night - ahead of schedule.  Of course, that means I need to start thinking about my next piece to keep the momentum going.  Looking at my chart (the one that breaks down my recent compositions into skill level and tonality), I need more major-key pieces for beginners and advanced students.  But here's the thing: looking at my royalty statement from September, most of my best-sellers are minor key pieces.  Here's the top five:

1. Gauntlet
2. Avatar
3. Gargoyles
4. Agincourt
5. A Breeze In the Keys

"Breeze" is the only major-key piece in the top five (actually, in the top seven) and I think that's due to the fact that it was new this year.  New music sells big at first, but Gauntlet and Gargoyles have been around for a while.  The conclusion that I'm drawing from this data is that minor key pieces sell better than major key pieces.  So now I'm thinking that I should focus on writing more minor-key music.