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We are smart people and we already know that Google can't stop all spam links
When creating an algorithm that has to handle trillions of webpages there will always be opportunities for an above average SEO to exploit weaknesses in the algo.
When properly managed in the right situation, an adwords campaign can be very profitable. You can spend a $1 and make $2 profit. This is why Adwords has been going strong for over 17 years
If Google wanted more money, all they need to do is place more adwords on top of organic results instead of having to perform a spamming conspiracy which could backfire and ruin the quality of their search results.
joined:Dec 9, 2001
You must be a genius to get a 50% conversion rate on adwords
- the average is 1.7%.
I am not buying this, I can personally think how Google can rid themselves of spam links, so I am damn sure they can do it with their brains. Therefore my conclusion is its deliberately allowed.