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Actually there are three since there are three million dollar prizes and all three require 107A.

Not necessarily. While you most likely won't win the sweepstakes, those aren't the only online prizes. You can also win Redbox rentals, gift cards (I won a $50 that way), & coupons for money off...

Just curious, but how do you figure out which are the rare vs semi-rare pieces for the prizes that have one of each?

It depends on what you consider money. I don't know anyone that's won a large or even a medium sized prize. But I have won instant cash prizes, online gift cards, instant gift cards, collect and win...