I have been going hard on my alts to get some flavor at 50 and have yet to run into a "twink". If they want to do that then eh I rather PvP with the 50's.
I've seen it a couple of times. Irony is, a lot of times they are not that good. My theory is they allow their advantage to take over and get lazy.
Every once in a while, I have seen one here and there which seems good; but it seems those people get bored and move on.