It 's bullshit thinking due to mass propaganda. Competition doesn't mean having a gazillion sellers "competing". Competition means that if a new seller enters the market, profit goes down, quality goes up. If a seller doesn't enter the market, it means he can't compete with the current price/quality offers.
If I open a service tomorrow selling luxury cars $10.000 a pop, no one will compete with me. That means total competition, not 0 competition - prices can't get lower. Compare this with having 10 sellers selling each car $100.000 a pop.