This is not something new, some time ago a french guy made an account, got to 1000 rating, then started to host only unranked games, Ofc. he would balance the games based on his 1000 rating, and since he had won a couple of hundred more unranked games, there was never a balance, the other team never had a chance.
Despite the flaw in global rating, there is logic to it :
- Rating was created to balance games
- Games without a rating system fell apart exactly because of the lack of imbalance between players in the team
So the question is, should you be allowed to host unranked games all the time, I don't think so an it goes agains two rules :
- rating manipulation : your rating will not reflect your skill level, even worse, neither your number of games
- smurfing : because of the rating manipulation your oponent has no idea of what your skill level is
Here is the latest pratical example :