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It affects everyone because Jagex designs MTX so that as many people as possible are psychologically manipulated into spending money. In the case of cosmetic MTX, they try to design them so that you would be attracted to them instead of non-MTX cosmetics, and when there's a boring/limited time grind "option" involved on getting the MTX cosmetics, that "option" is designed to be so boring/time consuming that you'd much rather pay to skip it.

Regarding the second part, if a player spends money to skip playing the game, they are literally not playing the game because they're skipping the action of doing it. If as a game designer/developer you produce gameplay that people would rather pay to skip than actually play, you have failed to produce fun gameplay. And games are supposed to be fun.

If Jagex designed the game to be fun as first priority, they'd either fix the boring parts to be fun or remove the boring parts entirely, instead of exploiting addicted people for more money like this. People already pay for the membership fee, that should get them a fun game without any boring parts.