1. Do you think extraterrestrial life exists? Yes.
If so, when and how will humans discover it? Not during my lifetime ...
maybe never ...
2. Should humans transmit a beacon for others to find? Why not.
3. Why do you run SETI@home? Its funny!
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.