Exactly, this is how it should be. Skipping ads/ad-revenue not glorify them by paying user to click it away. Please have a look at Coil.com it's exactly what they do.
>Also, what mechanism does coil have to prevent a “content creator” from bombarding the end user with ads?
Nothing. Coil is a payment provider for web monetization. It's up to the content creator to provide content in way people want to consume it. A content creator can of course still show ads to user who donate and piss off the user. And the user can of course still block ads or turn off donation for that site (or both). Donation hardly depend on the time you spend on a site. So if you go to a site and its overloaded with ads you simply leave. (The fact that people know that sites get donations if they stay on the site probably has a very positive effect on people behavior)