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It probably has to do with the game taking things away for no particular reason. If you didn’t know, King gives some people different stuff. I don’t know what type of events you have currently, but it’s most likely different from what I have. A good example is the thing that you’ve mentioned, watching ads for boosters. As a booster hoarder, I’d love that feature right now!
Anyone who spends any real money on offers in the game loses their ads a few days later and then they usually don't come back for a long time, or likely never.
Those of us who don't spend money also lose boosters every now and then when King decide to change which test group we re in. At the moment I have lost my ads too, though I have not spent anything. King are probably hoping that we will start to spend real money now that feature has been removed. If we stay firm and spend nothing then our ads may return next time they reallocate test groups. My best advice is to not spend real money if you want your ads back.