The $50,000 milestone is interesting. On one hand, players are currently only GUARANTEED $25,000 by answering 10 questions, but at the same time, answering those 10 questions usually entitles the player to around $50-60,000 which they are free to leave with. The only hit on the budget will be the fact that the free guess is reintroduced, this time for $100,000.
Is it high? Maybe. Will Q11 be harder to reach as a result? Perhaps. But once Q11 is attained, will Q12 and Q13 be easier to reach? I think it might.