Diablo 3 is fundamentally broken

[Lissa]

Only salvage level 60s for exquisites, sell everything else. Then sell your exquisite essence for good money too and go buy yourself a better item. Rinse, repeat, and die 50 more times.

Some 59s will grant you Inferno level crafting materials, as well. 58 and below are usually vendor trash, but at least it significantly ups your gold per hour.

Only some 59s will give Inferno level mats, most do not. Typically it's not worth tearing down level 59s as most of the time you'll get Hell mats and not Inferno mats (60 is guarenteed to get you Inferno mats).