*Shrug* I've been soloing efficiently since the start and although I haven't saved up 500k yet I have made far more than that in total. I've made enough to buy some of the more expensive outfits as well as all pink protection gems and wep. Solo farming for me is incredibly simple. Just get your defense up to about 200, gather a bunch of mobs, charge and release Leap, feed, rinse and repeat throughout the dungeon. On the last dungeon "A Fallen Angel" I average 500-700 gold per run in addition to whatever loot drops. I get 2-3 pink drops every 4 hours or so and I put them up on the auction to sell quickly. Since I pretty much have bought everything I want I'll be working on the 500k achievement now. It should only take a couple days.