Salaries and chalk... and travel, and equipment (even if it's just computers), this web-site, the person who designed it... It easily could get into hundreds of

Salaries and chalk... and travel, and equipment (even if it's just computers), this web-site, the person who designed it... It easily could get into hundreds of thousands per year, or even millions. It's not like this is a revenue-generating venture, so there's no return on that investment. It's pure donations. Most likely the money they raised came with strings attached. This website feels like that. Notice all the names of sponsors. "Sure, we'll give you a few million dollars, but we want to see that you are getting the idea out there and building education. Also, put our name all over it." Money doesn't grow on trees and getting it out of donors isn't easy.