Level 20 - 30 is a long, hard process with a lot of luck in between. It does offer some extra stuff, the raid being the main one. When all is done and you've completed the raid, you have the best gear, legendaries/exotics you name it, what is there to work for? I thought this was simply a level cap but the more I think about it I don't believe that to be the case, should it be raised then legendaries would eventually become the new uncommon and God like weapons/armour would be needed to compensate.
Just a thought, is all xD Anyone have any insight on this? :P
EDIT: Just to clarify, this isn't for me personally, I haven't got enough time to make it to 30 anytime soon, just speculating on what the game has to offer to those who have got there so fast.
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It's a FPS. You play the game and enjoy the combat just as you would any other FPS game. If this isn't enough, you can also do one of the following: - socialize with others in the tower (voice chat coming) - help others get through the raid on normal and hard difficulty - wait for the DLC - make a new character or recreate your lvl 30 character - perfect your equipment/armor build