Ad Removal Purchase

I'm so hooked that I seriously considered buying the ad removal option to cut down on time-extension ads, but I realized you can only remove forced ads, and the time-extension ads are reward ads, so they can't be removed, right? I won't do coin purchases because the cost is endless. I don't mind watching ads, but they reach their limit so quickly. Then, I can only extend the time with coins, and it's frustrating to have to quit when I want to play more~