It's rich people playing with their toys.
Edit: corrections.
However, the much more important thing for me is that we'd know we aren't necessarily going to run into some Great Filter [0]. I'd fret a little less about dangerous new technologies if I knew at least one case where a civilization survived.
Lastly, maybe we'd learn something from the signal itself! A new communications protocol, new music, new technologies, insight into how languages work - who knows? Finding out what we have in common with the beings who sent the signal and what we don't would teach us a great deal about what is arbitrary on our world and what's fundamental. It's like growing up in a society with extremely rigid gender roles and then traveling to a country where that's not the case - you get that "Oh I didn't realize women could even have jobs" moment, but potentially with problems that aren't self-imposed.
Just imagine what proof that we're not alone would mean for the world. I'm not positive it would galvanize everyone, but it would surely create new industry and untold number of jobs as we, as a world, decide to try to go and meet them.
Year after year the news reports another big experiement which cost millions to setup, and which claims to "give us answers as to how the universe was created". I just couldn't be less interested. It's rich people (Or taxpayer funded people) playing with their toys.
It must be great fun if space exploration is your hobby, like explorers of days gone by, but for most people it won't have any impact at all on their lives (Apart from wasting their taxes).
Not only is your statement disappointing to hear from anyone presuming to be technically literate, it is objectively wrong.
[1] Minus the part about it being a waste of taxes; just because people aren't interested doesn't mean it's not worthwhile, because people can be wrong.
