Just looking at the MacHeist site and I think their math is off. They say 25% of your purchase goes to charity. The Nano Bundle 2 is going for $19.95, meaning $5 will go to charity. As I write this, the site says they sold 22,157 copies. At $5 per copy, they should have given $110,775. However, on the site, they say they raised $109,276. WHere's the extra $1,000+?
If you have participated in MacHeist before you do not actually pay the 19.95, you pay 17.95 which would cause your calculations to be a little off.