Do MMOs Purposefully Exploit Human Psychology?

I see Tier 9 epic loot gear
Back in “the day” (read: late 80s & 90s), video games were simple things. You bought them, you played them, you moved on (unless you were an obsessive nutcase or Japanese). There was no such thing as downloadable content and the concept of achievements and trophies was rare. Today though, we’re flooded with it. You can barely look at a game on either the PC or a console and not see adverts for DLC or the billions of things you can accomplish insi

World of Warkraft...