My chinese hamster, Gypsy Bean is from P@H (although I didn't actually get her from there, I took her because she was no longer wanted in her previous home), and whenever I go in to get treats etc, they always have a few. They always seem to have LOADS of robos though I'm not sure if that's because robo's are less likely to fight.
I have the same problem with the exercise wheel with my girly hamster - she does seem to enjoy making it smell really bad! She does the exact same thing with her exercise ball only five minutes after being put into it, she's very smelly!!
The one problem I have with Gypsy Bean is that she wees on me a lot, heh. I think all hamsters do? She's really lovely and friendly though, and absolutely loves almonds and being stroked with one finger all the way down her back - she'll quite happily sit on my belly completely still for 5 minutes whilst I rub her back, before having a run around and climbing all over my tshirt