I've only messed around on the PTR realms a few times, mostly because it's so hard to get around to testing anything. You have to get glyphs crafted and gems cut that people may not have, and right now on the PTR's some professions are bugged and can't even be used. This leads me to this question.
Why can't the ptr realms have glyph/gems/and other items pertaining to equipment on vendors? I think they did this for glyphs once before but there just doesn't seem to be a reason why you can't just pick everything up and test it. I can't think of a reason why this would be bad considering it is a test realm.