Irritating messages to buy upgrade

The vendor is trying to force me to BUY!!! update - basically the same program but optimized for ios7. The constant messages drive me nuts. I am not prepared to pay for this, and I find this practice unethical. Uninstalling and will make sure not to buy any other products from this developer.

MOSS77777 about Buy Me a Pie! Classic - Grocery Shopping List, v3.4.6