The Market Police don’t haul you off if you pay something different than the “market wage.” Markets set a floor on wages by making it so you won’t get enough workers if you pay less. But companies can easily pay more than the floor if they want to. Obviously they don’t want to, because they love money, but it’s ridiculous to frame this as some iron law of markets.
Don't know about the banning situation, that'd require insider Facebook knowledge. I'm sure they ban some people.