I think you've scared everyone off with the price, I have to be honest and say it did make me cough. I use George and pocket George, they do every thing that I need so I would be reluctant to spend £65 on another program, plus I would have to buy an android phone which would be another expense.
At the moment your ap is very basic and I can't see many people spending that sort of money on something so basic. I know you are/were thinking of taking it further, but compared to other programs it has a long way to go.
This is not meant in a negative way and I take my hat off to you for trying, but I think it's got to offer a lot more for what you want to charge.
Just my humble opinion.