"Selling accounts can be stopped by the use of tracking I.P addresses, a big change in I.P could possibly mean a new owner and possible people could be checked out in a more in depth style to find out if they have sold their account." a huge number of players play runescape at friends houses, internet cafes, library's and school/work plus not forgetting people can move home and change their ISP'ers. i doubt jagex will waste too much time investigating whether they are selling the account or just the buyer moved home. but you are kinda right, but jagex wont investigate, their poor scripted programs will. in the summer of 2007 i went on holiday and used a computer there to log in runescape a few times, within a few weeks i was banned for account trading due to change in I.P.