I have wondered this exact same thing. Actually, my wife and I were discussing my addiction and I said "it will calm down once I hit max level". She then asked what that was and I told her Level 30...so maybe its just the completionist gamer in me that says "I want to beat this game and see all that it has to offer." This game is fun, but not when it takes so much grinding. However, if it weren't so grindy, we would probably be done with the limited content Bungie has provided at launch within the 3 weeks or so we have already played it, and all just playing PVP. The lottery/rng aspect has people hooked...and when all it takes to get a new lottery ticket (engram, xur money, raid loot) is a few hours of repetitive gameplay, we are all for it.