I run SETI@home due to my 'hope' that there is intelligent life somewhere else in the universe. I think the people who contribute to the project can do so in a more constructive matter as computers advance in speed and capacity, and it is generally done in a good way.
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.