I run SETI@home because I don't like the idea of my PC being switched on and it's processor not being in constant use. If it's going to eat up electricity then it can work for it's living damnit!
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.