Today I received the first check from Lulu with the proceeds from the first few months of Mathgen book sales: US\$76.32. I’ve just dispatched a check for the same amount to the American Mathematical Society.
Thanks to all who bought the books! Not only do you now own a fantastic conversation piece, but you’ve helped support real (non-randomly generated) mathematics research! And for those who haven’t: you still can.
Update: In the interests of transparency, here is the receipt (PDF).