Let's see, at least $500 on sticks, throttles, and pedals (stupid Windows 2000+)
3 new computers, probably another $2K
Probably $800 on monitors
I don't even want to think about how many hours at $2/hour in Warbirds, although I did get comped for a few months after I was CO for a scenario.
All together, probably a semester's tuition, room and board at a typical Ohio college. And seeing as my youngest has decided not to go to college, there's no down side. Woohoo!