Keeps crashing

Downloaded the free app, which provides a basic overview of live commodity prices. Paid 99ct to unlock all content, only to find out minimal added funtionality. The big surprise came when I tried to reopen the app a few hours later and the app keeps crashing. Deleted the app and downloaded it again. The app is now working, but requires me to spend 99ct for full acces again! I dont thinks so!

Mama-Renske about BlackGold - Oil, Gas, Gold, and Silver Tracking, v5.1.2