If you think they only work 3 days, you are sadly mistaken. Someone has to load the boat with supplies, help offload the crab and etc. I bet there is more than a month's worth of total work or more for those "3 days" of show time.
I'm not saying they don't get paid well for what they do, but all I know is i'd never do it. I know people that have gone up there to earn a payday and they'll never return. They say the amount of work you do overall just isn't worth it.