I really like this idea actually. If the performance would be (a lot) better, it could be a very nice alternative to advertising. Everyone who visits your website would 'pay' you with some CPU/GPU cycles, and in trade for that you give them a web page that's completely rid of advertising, third-party tracking cookies, and other stuff that users find annoying.

Personally I think advertising has been dying for years now, especially with all the adblockers that become more and more popular. It's time to come up with an alternative business model for websites (no, not talking about SaaS here..).

What's your share in this? You take a certain percentage of the mined coins?

Too bad mining is becoming more and more difficult, meaning that you will earn less and less.