There's a balance between making items too rare for casual players and too common for players who play 18 hours a day grinding them out. Since these drops are tradeable these grinders contribute a majority of the drops into the economy.
Call me controversial, but I do not think that Jagex should be basing their drops around players that play 18 hours a day, period. Maybe the numbers were a bit an exaggeration, but gaming for 18 hours a day is not healthy for anyone. That leaves less than six hours a day, to sleep, eat, and use the bathroom, let alone, work, study, and maintain interpersonal relationships. I respect that there are people with more time to play Runescape than others, and that's fine. But there's a difference between enthusiastically engaging in a game that you love and addictive-compulsive behavior.
I know that I'm not the first person to notice Jagex's hypocrisy in outwardly promoting mental health, while...