There are a ton of problems bundled up in this sentence, but I'm not sure I have time to unpack all of them.
But this is not an attitude that I think a game designer should ever have. I don't think we should be building experiences that boil down to teaching players that spending money is the equivalent of overcoming a challenge, I think players should be extremely suspicious of any game or experience that has that attitude towards challenge. Spending money is not the same thing as achieving something or earning a reward, I think it's really bad for us to encourage that kind of equivalency in a player's mind.
Meh, it's a free country and games like Runescape are a known quantity that players can choose. I would say that if you want to change minds then make your case, but clearly you don't have the time to do that.