Here is an idea for a new vendor in the game. A pawn shop vendor.
The Pawn shop vendor lets you trade a whole host of items for other items or materials.
The Pawn shop vendor can make items with greater affixes.
Random items have a power level of the average of input items or near your level if no input items.
Here is the complete massive list!
5 resplendent sparks → 1 Uber (moved from occultist recipe)
50 sparks —> Unique of your choice (You now gain 1 spark when you salvage a unique with +1 spark per GA.)
500 sparks —> Unique of your choice with at least 1 Greater affix
1 Obal - 5k gold
100 Obals → Random elixir
250 Obals → Random legendary (25% better rolls on aspect and the random range)
500 Obals → Random unique
750 - Obals → Scroll of Disenchanting. This scroll can be used to remove an affinity from an item. See below. While this scroll is in your inventory you will automatically convert all rares put in your inventory to crystals.
1000 Obals → PIT materials cache
1500 Obals → BOSS materials cache
2500 Obals → Resplendent Fragment. 5 Fragments = 1 Resplendent Spark
Any 2 royal gem → 1 royal gem of choice
Any 2 royal gem → Random legendary with max aspect
Any 3 royal gem → Random unique
1 of each royal gem and then 3 royal gems → Prismatic Gem (of 3 royal gem color). Prismatic gems are added to your account so you can use them on multiple characters. They are not better in any other way. Example you put in 1 of each royal gem and 1 extra ruby in pawn vendor. You will get 1 prismatic royal ruby.
Any item + royal ruby = Ruby affinity. More likely to roll max life or overpower damage on enchanting. Other gems follow this same pattern helping certain rolls according to gem. Affinity is permanent but can be replaced with another affinity. Affinity can be removed completely with a scroll of disenchanting.
Any 3 legendary items → Random legendary item (could have GA but very low chance)
Any 3 legendary items with same aspect → Random legendary item with same aspect at max
Any 3 legendary items with 1 GA → Random legendary with 1 GA
Any 3 legendary items with 2 GA → Random legendary with 2 GA
Any 3 legendary items with 3 GA → Random legendary with 3 GA
Uniques follow this same path as legendaries
Any 4 matching → random matching legendary or unique. This then follows the formula above so as an example any 4 focus with 1 GA will give you a random focus with 1 GA, ect.
Any 5 matching → Same as any 4 matching but also adds 150 to item power and max slots.
2 boss mat → 1 related boss mat. Example 2 eggs → 1 shard
5,000,000 gold → Random item. Could be legend. Could be unique. Could be mats. Could be rare. Could be gem fragments or herbs. ect.
400 cinders or 10 Rusty keys → Helltide key. A helltide key will open any helltide chest one time.
40 cinders → Rusty Helltide Key. This allows you to quickly spend cinders if you are running out of time in helltide.
EDIT ADDED IDEAS:
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Many good things this does to equalizing value of items to making useless items with GA giving you another yahtzee roll to changing boss mats to crafting needed uniques.
Any more good vendor formula you can think of? 
Thoughts on this idea? Wonderful 
man