... has anyone sold it as top soil, does it make good topsoil, I’ve been researching and get mixed reviews
You have been getting mixed reviews, because not all "muck" is created equal!
It sounds like your muck "should" be a decent candidate for sale, because all of the stalks and leaves are organic material that are part of good top soil.
It appears that this is on your "long-term" project list. If so, then I would advise you run a small-scale experiment first. Do the thin layers and disking exactly like you proposed. If it is good to produce valuable top soil, then you should have a good crop of weeds on that patch next spring or summer.
If you really want good marketing for your "organically sourced muck", you could take a "before" picture next spring, and then throw on some grass seed right after you disk.
If you get some great "after" pictures showing lush grass, you might be able to get that $35/yard price for your special muck.
