You're correct of course. My devils argument to that however is an increase from 0 to a natural number will always be a larger % increase than 4$ to 10$ etc. T

You're correct of course. My devils argument to that however is an increase from 0 to a natural number will always be a larger % increase than 4$ to 10$ etc. The other argument would be paid for services tend to be setup with the expectation that the price will increase ( inflation for instance ). Where as an always free gives the expectation that it'll always be free and as such a user might specifically design their system to stay within that limit.