What do you mean by " the content itself isn't part of the bet ". I assume you mean the value of the content inside the boosters. If so then no the total value I end up with in cards do not affect the bet in anyway. I need to get 50 boosters and spend no more then $100 in my initial investment. I can use my rewards earned along the way. Which would include leveling up / selling. Since buying on the market is against the rules I would only be allowed to buy boosters from any profits selling my cards found in boosters.
However even though it is within the rules of the bet that I can sell cards earned in booster packs I will likely not do this. I certainly wouldn't be selling any GFL if I hit one. The point of the bet ( on my end ) is to show that a decent size return is possible with a minimum investment. $100 invested while opening and selling content is still $100 invested. It cost me nothing to open boosters and sell cards earned via daily rewards.
I think jarvie means the posts about this bet!