On the one hand, I applaud the ability of people to use more than one account at once, AFK'able abilities aside. On the other, it gives them an advantage over people who do not multi-log for the purpose of honoring a personal moral code which may or may not be linked to the original RS rules (me and some others) and those who don't do it because they can't handle the multi-tasking. If you are complaining that it breaks the xp rates b/c some people have extra accounts to do their resource gathering for them, I basically see it as the same thing as hiring someone to do it for you, only instead of paying in money you pay in extra attention to the game. Anyways, the 2x xp means that the highscore rates should be half of what they are anyways. -.-
However, if a person uses multiple accounts to make, say, a million air runes, and then floods the market - well, every other air rune crafter is going to be out of luck, and there really isn't much these players can do except wait for prices to stabilize or train magic themselves.
I don't know whether or not it's our call to try to ban multi-logging. I do believe that those who do multi-log should at least try not to cause some sort of game-changing market crash or similar problem.
-Diz