I agree: I know a large amount of people that are in really bad relationships for the sake of being in a relationship. I haven't been in one in over a year, the exception being when I tried giving a shot with someone I liked but it didn't quite work out. I talked to him recently and when he found I was single he told me that he didn't doubt it because he thought I "didn't like being in relationships," to which I replied I just don't do pointless, negative, toxic, and destructive relationships....all of this, mind you, after he spent an hour b!tchin' and moaning about how badly things have been going with his current boyfriend (and really, that relationship has been a mess).
Quite frankly, I'm single for the same reason: because it's really hard to come across a guy that understands what it means to have a REAL relationship, specially at my age.
At this point I'm just in that same boat: I'm keeping myself available but I'm not really bothering to look for the crazies that always seem to follow me. I figure that eventually, I'll just run into someone really worth the time, the effort, and the love...and if I don't, well I'm living my life, loving MYSELF, and enjoying every minute of it. So it's not like I'm wasting time :)