I think CS:GO is #1 in part because you can
make a lot of money from selling cards, especial certain rare ones, on the Community Market. 4 of the Top 10 go for as much as $436 a piece.
#2 StatTrak™ Karambit | Doppler (Minimal Wear)... Starting at: $436.01
#4 StatTrak™ Flip Knife | Lore (Minimal Wear)... Starting at: $426.10
#9 Karambit | Crimson Web (Minimal Wear)... Starting at: $415.44
#10 StatTrak™ Karambit | Doppler (Factory New).... Starting at: $415.44
The most exercise some people get is jumping to conclusions.