Oh of course they don't support it, Raven, but it happens ALL the time on RS (it doesn't make it right, tho!) ...just take a look at ebay! Type in runescape and tons of things come up. They are all scams in my opinion, and of course, the one's buying it never/seldom get what they paid for, but it does happen.
It even happens with big-time mmorpg's like ultima online, too, for that matter. Just search it up on ebay, "ultima online account". (I saw people selling rare UO items for as much as $30 - $81, and what's sadder, people actually bidding on these items!) It's very sad, and not the right way to make money at all! I'm glad this game doesn't have that sort of thing.
That's why I quit playing runescape... people were buying their stuff off of ebay and cheaping up the game... and then it became impossible for newbies and the poorer players to get ahead. (Thus the reason behind the massive 5,000 player ban a couple of months ago!)
Oh and sorry for the difficulty in my name, guys
It's my home state of Alabama paired with my online nickname... Angyl. U could all just call me Angyl if ya like!