If you are buying a CALL, then you have UNLIMITED upside potential... if you are shorting a PUT then the MAX you can make is the difference between the price of the PUT and zero.
For example - I short a put that is $5. And let's say that the PUT expires worth zero. The MOST I will make is that $5.
But if I buy a call for $5... then the MAX I will make is whatever the potential upside is for the BO of the particular movie. Does that make sense?
This isn't to discourage you from shorting PUTS - lots of times it's easy money. You just want to adjust your expectations accordingly as the upside can be limited.