If you do that for a few days, people are going to stop clicking on your clickbait titles with no content.
I totally get rotating headlines to see which gets more clicks. I do not get rotating titles before the article is written.. that is going to make users quit clicking on your ads very quick ;)
If this tragedy of the commons really kicks in, you can bet advertisers will start calling for FCC intervention...
I disagree. If you're one of the (few) companies that spend a significant amount of time planning and writing articles, then $40 is a very low amount to pay to learn which angle/theme/lede will get the best results, before your team spends time planning, researching, writing, and editing.
I'd say most places putting out good content are investing far more than $40 on each piece.
Personally, I think you're much better off doing some keyword research to find what people are interested in and creating articles based on that instead of trying to back into a headline that fits your intended content.