and if you get two (imagine getting a yellow before the match, refusing to take off the band and getting another for walking out with one)

Your team plays with 1 less player for the entire game (basically a guaranteed loss)

The US is actually in a fine position to do this, they may honestly fail to get to the knockout round.

But the Men (unlike the women) get paid based exclusively on performance. The better they do, the more they get paid (but MuH WaGe GaP- the women wanted guaranteed contracts, the men only wanted paid if they win).