I have spent over 60k at the purveyor of curiosity this season, and I can confidently say there isn’t any real RNG, atleast when it comes to great affix items. If there is any, it’s very little. I made it a point to only spend my obols on tunic’s (chest piece) only and out of all the spending almost every single GA item was the thorns unique chest piece. Never double greater, just single. I got the soul brand once, and a standard legendary item with a GA two times. Atleast 20+ unique thorns chest piece (at work can’t remember the name). It feels extremely lack luster, especially with how hard farming legendary items is this season. I’m a huge d4 fan, not a hater by any means. Just really hope they spice up the variety at the purveyor.
Its no different then greed vendors in D2. Ive gotten some GA from him and it was good as that im starting to gear perspective.
Other then getting affixes from him i wouldnt put to much feeling into the RNG.