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Good game developers should be tapping into forums for good ideas in terms of end game progression.So how come none of the big name developers come up with some thing innovative that they can stick with, rather than switching between the standard 'treadmills' ?
How about stuff like, (not saying they are good, but pls feel free to comment, always nice to hear a diff. perspective)
Some sort of score that is redeemable against future paid content. (helps keep ppl arnd, a games greatest assest is its player base and its inherent inertia)
Player controlled boss fights ? Down a boss, use his avatar, power whatever for a limited duration in pvp and crap like that.
Guild control of towns, who then earn a fraction of the entire economy of that town, (auction house, waypoints, trades, whatever)
I dont think horizontal progression via addl. skills etc is viable it prob will wreck other elements of the game.