Things I just did in about 3.5 hours:

--Completed my 'of Light' set, except for boots but that's b/c I have the Syrcus pair on.
--Upgraded to Zenith
--Won a shitton of BRD pieces from greed rolls.
--Decided to give up and give Archer a try, only DPS I haven't played enough to understand their playstyle and still haven't found one I fully enjoy.
--Started plans to complete the Syrcus set, because wynaut.

If you're having fun its not useless at all lol.

On a more serious note, play around with other things I suppose. For me, if all else fails, I have coursework and a big pile of games I haven't touched yet.