Buy miners with the ad revenue? Then burn 50% of the mined tokens and then sell the other 50% to buy more miners?
That's an interesting idea. We'll think on it a bit and run some numbers. It wouldn't be enough to create a deflationary currency though because miners only divert 15% of the total rewards pool.
maybe not deflationary, but you could run cool live statistics like https://leo.bitfinex.com/ where you can see the burning rate etc. it makes so much sense in my opinion :D