You misunderstood. The point wasn't to make an evil bit.

If we're going to have the semantic web, isn't advertising an important part of any page layout. Good grief, we have header, footer, microtags, and god knows what else. Advertising is at least as semantically important as the rest of it.

After all, that's all adblockers are trying to do anyway -- identify the semantic purpose of those hunks of code used for content sponsorship. This is semantically important even if nothing else changes in the deliver-render system.