Guys, nobody cares about what you willing to pay for those, only one person who should care about this is an author and since he doesn’t care, your opinion totally irrelevant.
I wouldn’t pay for it 150$ same as 5$, because i dont need those, but when it would came to real project, with any real budget, lets say “small one”, 150k$ total, this purchase might be a really good investment and if this time comes, would you bother with overkill workflow and insufficient time spending by author? no you wouldn’t, because authors month of work is your 10$ investment, which is scam if you really think about it. And the less people buy those, less chance those textures would be used, more unique your project are.
For a real project which need those textures - it is a perfect chose, for everyone else - nobody cares, go and find your perfect chose.