wait, how is that possible?

Point transfers are:

2,000 Miles -> 10,000 points -> 1:5 ratio
5,000 Miles -> 20,000 points -> 1:4 ratio
10,000 Miles -> 30,000 points -> 1:3 ratio
25,000 Miles -> 70,000 points -> 1:2.8 ratio
50,000 Miles -> 125,000 points -> 1:2.5 ratio

on the other hand 100,000 miles isn't an option and it would be at an incredible 1:2.2 ratio

Source: https://marriott.com/rewards/usepoints/moreairmi.mi