The thing that makes it unplayable the most is definitely the manastone and enchantment stone prices. Even white crit strike manastones are almost 200k. How the hell are new players supposed to socket anything??
As for enchanting, when you get to the point in gear progression where you need enchantments, you just hit a wall. There's no way you can afford it, unless you farm BTHM sell runs, but guess what, you need great gear for that first, and so you're stuck. Also, selling untradeable instance drops is the purest exploit and should never be required as part of progression. If anything, it should be a punishable offense.