It really isn't. And dropping 1.5k on a .com isn't either in my opinion. Web application markets are evolving, people will look for a product name, not a url system that's not even relevant to a user, unless it is for browsing files.
One major caveat: word of mouth will lose the extension in translation. People still assume .com first if they can't think of anything else. Scale up, and that's a sizable portion of lost users.
That is a good point. It's tough though, I agree that in the future, the URL system might not be as important. However, right now that transition hasn't been made.
Regardless of sarcastic intent, stop and think for a second about how you'll feel when someone DOES register one of those domains. If your site becomes popular and you don't own all of them, which domains would impact your business the most? If you're serious, buy those ones before they become valuable.