1. Because we never know what / who we will find out there.
2. Its not my favorite project but i will run the WOW event each year. I signed up for this a long time about, probably around the time the movie "contact" came out
3. More badges.
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.