Why do you run SETI@home?
SETI seems a more worthwhile use of CPU time than 'idle loop', 'kernel(idle)' etc.
IMO All research is worthwhile.
Thoughts about ETI
Not really bothered whether intelligent life is out there. The odds are in favour, assuming the God-botherers aren't 100% correct. I would imagine any ETs wouldn't have to look like humans in drag, or be instantly fatal to people in red shirts.
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.