Because they can, and the LCF. Like why did I spend like 1200$ on a belt fed 22 LR upper for my AR. It was fun. Not every gun you buy has to be for precsion, or you need to shoot 10s, people are allowed to spray and pray mag dump. Clearly they're not buying them to compete in the 1/2" challenge.
I spent 500$ to make my 1022 look like a AK 74U, 100$ to make it look like a MG42.
Why gotta be a old man and piss on people parade? Because they're having fun and here you are on the internet #####ing about them.
Funny thing about the A team. I was watching it when I was loading 700rds on belts.