I know that RFF is full of members who believe that this is the greatest team since sliced bread. I never have and do not share those sentiments, although I do consider them competent racers. Pain while walking was evident with Bopper and it looks like Mark may have some other type of physical constraint. They are being worn down by AR20, which happens to many good teams. You just cannot stay in an amazing race with those type of issues.
Also, I find Mark's complaints that he just has to get the million to raise his kids. He and Bopper started with a statistically even chance for a payoff (basically cross-multiplying various outcomes times their probabilities). Depending on what the values of 2nd through 6th place are, they now have a $200,000 (before taxes) payoff from 1st place and a summation of perhaps $50,000 for 20% chances at places 2 through 5. In real money, it's either the million or relatively small amounts. I doubt that Mark/Bopper will win the big money.
My ultimate advice to Mark is that if you need big money to raise your children, then get the qualifications for a high-income job.