Why do you run SETI@home?
Expansion of knowledge is always worthwhile. The quest - whether successful or not has already helped process vast amounts of data that would otherwise still be awaiting processing.
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.