Most all of mine are in what I would call good to very good condition. Some have minor scuffs and none with major dings. I just tend to keep my stuff in good condition.
That’s what I do, and when I’m out and about, I’ll take a plastic with me. Not saying I don’t care about the plastic yoyo, but they are easier to replace should they go and finally fall apart.
For me it is being carefull and having a shorter string. I too play over a hard wood floor and have hit the wood many a time with no dings. Wood can be very forgiving… I have a Y Factor I got in August 2010 still dead mint… Just luck I guess.
I use longer strings because I am very short, so belly button length doesn’t cut it (pun intended). I just keep my throwhand arm up higher so the yoyo doesn’t hit the ground.