Was the original emailer telling Divvy that he won't pay $14 dollars for something that continues to have pop-up ads? Or was he saying he can't pay the $14 dollars (and the price was quoted on a pop-up)?
Apparently the only difference between the unregistered and registered versions is a pop-up. The OP was telling Divvy that removing the pop-up was worth $5 to him, but not $14.