Same question is, why do people smurf? Because they suck at their own rank and get a new account to play against silvers, so they can get the " I'm so goooood" feeling, en be writing ez every round but havent realized they are playing against silvers, and they suck at their own rank.
People cheat because to get that nice feeling, and satisfaction. Same with smurfs because they suck so much at their own ranks.
I've cheated in csgo on my alt, only if i encounter smurf to provoke them for getting rekt from a silver or gn.