Here is a suggestion, since pretty much everything can be sold or bought, even seen on the night vendor. How about you make it so FS or advice of valks can be sold. Most of us playign the game still enjoy it and want to continue to enjoy it, but your enhancement system is the pinacle of RNG / loot box / gambling addiction and we are tired of it. Most of us have an abundance of fail stacks and advice of valks sitting doing nothing because its kind of pointless using them. Its a giant money dump to increase your fail stacks by 1 with accessories or a few with armor and weapons, which in reality, doesnt do anything. It doesnt increase your chances to succeed in your enhancements, and just because you say it does and now have your game show a % number, doesnt mean it reflects anything. And most of us are just really tired of it, we have hundreds of advice of valks of different fail stacks values doing nothing, because why would we want to use our 100 fail stacks, or 130 or 150 on anything worth anything. In the tet and pen enhancemtns stages, its a pure money loss when enhancing, and only those very few players, (most who stream) because they get money from you, sponsor money, twitch money fro viewers, do it as entertainment for others. The rest of us players, you know, the 98 to 99% of your players, are just really tired of it. I and a lot of us would be more than happy to be able to sell these fail stacks and advice of valks to other players. You already have a standard of price and value for them based off how you sell them from the nightvendor. I would much more appreaciate and find it valuable to have silver from selling my advice of valks, than increasing my 150 fail stack to 200 by losing on average 2 to 3 times what i would get on succeeding. At the same time, even lower level enhancement are broken and not worth it, you can say rng gets you wins and loses and its just rng. Some players see averages over time, mostly over thousands of atempts, but others dont and dont want to bother trying thousands of atempts to see averages when after a few hundred tries, the % number you display doesnt match up with reality. 

Or advice of valks stacking. We all know that even 100 or 150 FS has no value, that's garbage. But advice of valks +20 stacking 10 times to 200 FS (or even more) then it makes sense to try Tet or Pen. 

While it would be nice in theory, in reality due to PA giving away shitloads of FS, that would obliterate it's value if the people who never use them would just dump it on market.

Failstacks are money plain and simple even if u fail and lose the chance for billions at click of botton. (comes back three months later LOST 200BILLION)

Atleast i got my stacks lol well depending on how you slice it there are ways to increase your chance of sucess it depends how you click and when you click and where you click. Sometimes you can only get a single duo before u lose profit. Going for Pen is just for fun if you want to be smart you will buy it but making your own is part of the game so try your luck.