I have NO idea anything about their closeout flowers, but as far as the tropical flowers, that they sell in their normal flowers section, I don't think they were thin. I have only bought a few though.
As far as fraying goes, yes, you have good ones and bad ones, they are all made in China, so for the price you are paying, expect some like that.
What I do, is just trim the fray parts off. Sometimes you will run into a petal, not cut right, so I just trim those too.
I have never bought any of their closeout flowers. I have heard others, say that their older syles flowers weren't so good. So maybe someone else would know more, to help you out.