And there was me thinking a cool couple of mill might help (i'm sitting on 70 Billion gold so I know what you mean about lack of things to spend it on)
For me, it mostly went on repairs, transmogs and crafting. Once I hit 70 I always seemed to have way better gear than anything the vendors had on offer.
Logged on yesterday for the first time in ages and did a few rifts - I like the idea of the set dungeons, might have to investigate further at some point.
I've lost a little bit of enthusiasm since I got the Platinum trophy (i'm on around Paragon Level 7000) but I can't deny it's one of the best games i've played the last few years.