If I have a pool full of sharks, and a bag of money with a million dollars at the bottom of it, and I throw out the challenge to offer that bag of money to anybody willing to jump in and grab it, I have established the challenge. It isn't up to me but up to those that take up the challenge to decide whether it can be done or not. They are the ones managing that risk. They are the ones that decide, hey I'm single, down on my luck what have I got to lose, or hey I'm married, with a family and a good job earning lots of money, not worth the risk.
Because the challenge has been established it isn't up to me to manage the risk for them by reducing the number of sharks, that would undermine the event, by making it "easier". The only thing I am responsible for in this regard is creating enough incentive to lure people into the shark tank. So instead of reducing the number of sharks, I increase the amount of money. In doing so, the challenge remains the same, the difference is the reward has been increased.
It's like the tight rope walker. Without the use of a safety net establishes a certain challenge. Adding a safety net makes that challenge easier. It's not up to me to make the events easier, it's up to me to provide enough incentive to entice somebody onto that tight rope without the safety net.
It's up to those that choose to walk out on that rope to decide whether it is worth the risk or not!