1-There's a whole lot of space...it would be kind of expected if there where life out there.
2-A beacon could be intercepted but imagine what it would take. If we do it the matematical language would be the best or... at least a something like I Will Survive from Glorya Gayner!
3- I did it because it is a valuable help for SETI and then I would be part of an gigantic 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.