For several reasons. I constantly get bombarded with the same darn popup that asks me to buy ad free experience for $20 bucks. Next reason, $20 to remove ads really? This is an idle clicking, one dimensional simple game with no content, not a full blown AAA game from a large multimillion dollar game designing firm. Removing ads should be literally 10% what your asking. If it were reasonable, maybe I would have payed to get rid of the ads, but for the reasons I outlined above, I'll just hack it