Thanks for your reply, but this doesn't work.
My app sells for 1.49, but unchecking this box causes the price to be suggested at 2.00. If i check this box, and enter 1.49 it is rejected. The smallest i can make it by checking the box is 1.50.
There are already "tip" buttons that people can press if they wish to add a donation. I don't like the idea of having a "built-in" suggested tip as this is an imposition on peoples' generosity.
Any suggestions? thanks.