I do not think that all subjective details should be put in the book. Details should be discussed before its presentation. Sometimes I see that my point should be corrected or sounds not good. I would say that buying option it is a chance that I would exercise it earlier maturity. Mainly, If at some moment rate of return on option will exceed the option return in case when S ( 90 ) = 105 and probably for the case when S ( 90 ) = 104 too.I'm almost tempted to buy list's books...or is that part of a cunning plot!