It has recently came to my attention that the guy I like is very cheap. Like he is in his mid-20's and doesn't even own any furniture, just a mattress. And he lives alone, which makes not having furniture all the more weird. This is a huge turn off to me. I don't mind a guy who is good at saving money, but a guy who doesn't even spend money on things he clearly needs is a bad deal.
Have you ever seen the episode of The Office where Michael is talking about bringing a girl home, but he is worried because he sleeps on a futon? I feel like that.
Some of my mates will probably be like that in a few years, it annoys me that they're so shabby. Is it just furniture he neglects because he may just not prioritize that stuff or does he try not to spend money on anything, if so there's nothing really you can do unless you have been going out with him for a while and then you could try talk.
Some guys are just raised to be cheap; they might have money pinching parents and feel the need to make sure money isn't wasted although the money they save is usually spent on stuff which totally irrelevant - it's one of those common male defects!
Did you ask him why? He might be just barely able to afford the apartment so he's getting his furniture one step at a time. Or he just moved and that's all he's been able to bring over so far. Or he was living with a room mate and all the furniture was his roomie's so it left with him. If you think it's gross or stupid or whatever then talk to him about what's going on in a polite, caring way. If you really can't stand it then leave. He doesn't need someone he really cares about just judging him and criticizing him in their head 24/7.
"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!