"Why do you run SETI@home?" I find the technology interesting and I like the idea of looking for life beyond our own solar system. I really don't think it's likely we're going to find an alien civilization this way, but there are other things we can learn from this project.
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.