seti at home is a fabulous way to rob precious processor cycles from tremendously expensive computers that would otherwise be engaged in important, profit-generating work and donate it to what is probably a total waste of time.
unless you consider the whole teams thing, in which case it makes perfect sense.
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.