I think when Jagex introduced the completionist cape into the game, Runescape went from a game with seemingly endless possibilities to have a potential "finish". Whether 200m experience in every skill supersedes that is another argument, however I think if you maxed out now and got the cape compared to say 4 years ago you'd feel there is less to accomplish seeing as you've "completed" the game. To keep these loyal players interested with more things to do I think is where Jagex ends up "power creeping" some game content. Once many people have got the cape, what is there more to do for them? Other than introducing something like the QBD for them to kill. I think Jagex has -more recently- avoided this issue though; the QBD though potentially the most difficult foe in the game doesn't actually give much high end gear. Nex however does give incredibly powered gear, but then again is more challenging as a boss to actually obtain the drops themselves. For high leveled/experienced players, when more gear is introduced which is better than their current, and they can immediately access that; sure it's power creeping from our point of view. But then again, the gaps between levels are being filled in for Jagexs' future customers, so they can easily jump from weapon to weapon as they progress up to the ultimate gear, so whether it's debilitating for Jagex's income, i'm not so sure