Marriott points are worth 40p in the secondary market. Also 80k points are too little to book anything meaningful.
During the bonus reward phase of Axis Magnus, a 1L expenditure could get you 31k edge points. (25k bonus + 6k standard), that too without any boosters.
At 5:6 ratio (Using Edge --> ITC --> Marriott), 31k edge translates to 37k Marriott points. With boosters, it can be between 40-80k (depending on how smartly you play it)
So, dude, selling pts at 60p is ridiculous right now.
Save them for later, right now all the magnus points are in the market for sale. And they're cheap.
I have 2L+ ITC green points, I know what I'm talking about