I personally believe that should be an exponential graph. F' around some and most do nothing. But, there is a point where a little amplitude in F'ing around, results in a huge Find Out response.
Like advertising expenditures. If you spend too little you get no return. Past a certain point the return ramps up linearly, then exponentially. But past another certain point the marginal return is zero.
I think FAFO follows the same pattern. Like poking the bear.