There shouldn't be an argument to this, player skins cause a lot of problems.
First CSGO hitboxes are already broken, and with the skins, they are even more broken.
Second, there are a crap ton of people who just beg for credits so they can buy it.
I dont really have a third, so...
EDIT: Third, it causes a shit ton of rdming. TTT players will know what I am talking about. In TTT, the majority of false kos's falls down to kosing off of skin.
There you have my three reasons for why skins are a huge problem and should therefore be removed to fix these issues and many other issues.