Hmmm... We may learn something new about our universe. Who can tell what may be the result. I wonder how many people thought that the exploration of the new world a few years back (which finally resulted in the founding of the United States) was also absurd.
Taxpayers? Last time I looked, I was not using a dime of taxpayer money. You can slam SETI all you want. This is ok I really don't care. But you may want to look again at what is being funded and what is not before making those kinds of assumptions.