Imagine how many runescape players left to go to other MMORPGs with a similar action bar system. Of course, I'm speaking of RS gold World of Warcraft. Now I'm not saying runescape should be more like WOW, not at all, but most moos today adhere to the EOC-style of HCI. What is the reason that 99% of them are doing this?

Because it has been proven to be effective. It is impossible to keep up with the speed of this game. Not just from a gaming perspective but cheap RuneScape gold also from a commercial standpoint. Jagex has to earn profits, pay taxes, and also pay its employees. If they didn't keep runescape on par with competition it could quickly be a victim of.