I consider myself lucky (4 legendaries in under 65 hours) but still see the problem with this game.
I only have like 2M gold. I haven't sold anything big (all my legendaries are being used by me currently) and there was a point where my dps was just stuck under 30k. Hell, I'm barely above 40k right now and I too can see how frustrating it is to gear up.
It's a vicious cycle. If you can't find loot, you go buy it, but that costs tons of gold, which you most likely don't have b/c you can't sell anything. Rinse/repeat.
I guess I'm still trying to get myself to not compare this game to WoW. It's not an MMO and I think once come to terms with that, I'll enjoy the game more for what it is.