If they were several c that was probably people trying to price fix. They’ll put some up for “sale” but never actually sell them, trying to get folks to sell theirs at that price.
I haven’t played much this league, but I’d never sell one. The loot is the point, why not see what you get?
And while I didn’t play much this league (only got to delve 80 or 90), it’s not because I didn’t enjoy it, I just got distracted by newer stuff. I too prefer Delve over Incursion, easily. I really hope it goes core and is fairly easy to run regularly.
I tend to play a lot one league, then cut back the next and unfortunately I put quite a bit of time into Incursion. Wish they’d been reversed.