I run seti@home because of the following reason:
1.Make my contribution to seti
2.Join the competition of seti@home unit crunching.
3.Keep my pc running. I can't bear to let it on without doing anything.
I believe some of planets have the life as the earth, sooner or later we will find them. And now we are doing this.So I keep my computers running 7/24.
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.