Why is the Inferno 5 Combat Rating so high?

In this INF1/INF5 farming method, none of the four players are actually capable of doing INF5 dungeons.
That’s the absolute truth.

Three of the four players are receiving rewards that none of them are capable of earning.
That’s the absolute truth.

No, it’s a logical fallacy to imply that simply because something is popular it must be true / correct or, conversely, that if it is unpopular it must be false / incorrect. My logic’s sound, i.e. if all four players are incapable of doing INF5, they shouldn’t be getting rewards from INF5.