"Aliens" do exist and it’s only a matter of time establishing contact with them.
I believe that we must transmit a beacon for others to find only when we know where to. Why I'm running SETI@home? I don't know.
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.