I have the Pro version of Buy Me A Pie, but I did not pay $25 for it. Looking at the price history of the App, they recently increased the price of the App (from $2.99). I think they did this to discourage people from buying it at the moment as a new version is about to be released.
I emailed the developer (regarding Apple Watch support earlier this week) and told me a new version is on the way and will be released soon.
Edit: Buy Me a Pie is a great app which I use all the time, but it is not worth $25 if they really are intending this to be the new price point. It was great for $2.99