Ads appear everywhere immediately when published, very few people are visiting some random hacked blogs. Ads are THE vector of choice for browser malware. You may not be safe from the browser exploit with an adblocker, but you will be safe from the method most exploits are delivered.

I've personally encountered multiple hacked sites and zero malicious ads (so far as I know). Like I said, I'd be really curious if anyone has actual data on different exploit vectors rather than just arguing anecdotes.

I think my point remains, however, that if your browser can be compromised by visiting a URL then you are in a bad situation ad blocker or not.

A non-technically inclined person might click on the wrong "download" button.