They indeed are. They ain't dumb that good ol' place. Example.
Bots(Members).
$5.99 USD p/m
Jagex estimates 40,00 Bots currently run and about 3000-5000 get banned monthly, Let's just say Minimum that 5% of those bots are membered. That is $11,980 p/m x 12mnths = $143,760. We are the public so our figures we get aren't precise, but it equals a fortune... Than you add the legit member's and you get a HUGE amount of in-come for the company that isn't fighting against bots. It's what makes RuneScape $$$$$$