I thought it would be interesting to take a look over the mount gamepasses bought over the years in R2DA. After looking through all of the gamepasses, I've come to pretty interesting conclusions:
Highest Amount (1) to Lowest Amount (8) of Gamepasses Sold:
Toy Plane (Previously Red Gift)
Sleigh (Previously Pink Gift)
Reason 2 Data
Duck is considered as one of the best mounts in the game so it's reasonable for Duck to be at the highest, not to mention how long the event lasted.
Pumpkin Bot is beyond me. I haven't started playing R2DA in 2018 so idk. It's possible that it served as a reliable "jump" mount before Duck took over... or maybe because it just looked cool.
Toy Plane (or Red Gift) was bought more than Sleigh (or Pink Gift) in hopes of players (that didn't have sleigh) to become the next "flying" mount... but I guess no one expected to get an explosive one.
M2 Tripod was pretty decent until it was nerfed to oblivion by PR because of farmers taking advantage of the mount's abilities.
Ice Rhino and Mini Crab are also beyond me.
Jetski was by far the easiest mount to get (wasn't placed on one small chest among all other chests) but it isn't as reliable because there aren't many water maps (as of this date).
I was bored so I wanted to do something to spend my time off :P