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Hi and Welcome to the King Community
Thank you for the feedback. The video ad feature as all ads and promotional features is still a test feature in the game, which means that some of you can get Lives, while others can get Boosters or other items from this feature.
This also means that the video ads will not always be available and not found in all player's games or on all devices.
So if you at the moment are missing the ads in your game, just stay tuned and keep an eye in the game to see when the ads are back.
For more Info Here
You answered your own question. Once you spend real money in the game the ads go away, and yes, King would love for you to keep spending more. You may get ads back some time in the future, but it will probably not be soon. If it's any consolation, you can play and win without ads or spending money. Just try to save up boosters and gold bars for those really hard levels.