i think its more of a wall not for RNG luck, but a wall for whether you really want to upgrade that extra few % to make it a perfect roll. this whole game is RNG though so i mean, nothing really to complain about playing it.
veiled crystal materials cost more as you reroll more. so its not constant. i had a ring that i rerolled like 40 times and veiled crystals costed 16 each time instead of the original 4 or so.
gold is easy to make up through rift runs. collect all blues/yellows, then sell them. go to kadala, buy belts or something cheap (that you could also use for an upgrade if you happen to get a leg) and sell those as well.
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rinse and repeat to get craft materials too.
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for the life of me, i can't find a cinder coat :/