Why do cheaters host PUGs?

This would be my assumption. The few times I was unfortunate enough to run into a missile glitcher on ME3MP, I asked over the mic why they felt the need to ruin the fun and enjoyment of public lobbies with their bullshit.

They'd get offended and felt they were helping us to free credits.

At which point I told them they could go fuck themselves with something hard and sandpapery and left, despite knowing I'd lose the consumables I had equipped, because I'd joined the match to have fun playing it and kill things, not to watch some asshat use infinite missiles to kill everything for us. I was spoon-fed when I was a toddler. The only other time in my life I wish to be spoon-fed again is when I am old and decrepit in a nursing home. Until them, don't try to fucking "help" me to free credits by sucking the enjoyment out of the game.

/rant