Let me get this straight.
"the guy I like": First off, does he like you back? You're really in no position to judge a guy who has no interest in you. Besides, if it's a huge turn off, just go find someone with furniture. At least from your post, it doesn't even sound like you're dating, and this makes you weirder.
Also, I'm in my mid-20s, and I live with very little furniture (although admittedly more than what this guy has). It's not because I want to save money. My job requires that I move around every couple years for the next 5-10 years. Having a lot of nice furniture is a hassle, and really, a waste of money.
"he lives alone" well, at least he makes enough to be able to support himself. IMHO, having roommates in your mid-to-late-20s is weirder. You should really be looking to settle down at this age.
I have some friends who make 6-figure income in NYC. "your" guy sounds like he has similar lifestyle to these friends. Even though they make tons of money, all of their places basically have a mattress and a futon, just because they have no time to make their place look nice.
Finally, I hope you live up to him - do you make at least as much as he does? When you're judging someone, at least make sure that you're qualified to judge them!