Through Friday [Feb 21], he's spent $505.8 million on broadcast, cable, radio and digital ads, according to Advertising Analytics. That's an average of $5.5 million a day since he officially became a candidate.

It's also $190 million more than all of his active Democratic rivals combined, including billionaire hedge-fund founder Tom Steyer, have spent on political ads.

This all netted Michael Bloomberg a whopping twenty-seven delegates. That's more than $18 million per delegate. This means Bloomberg didn't even succeed in becoming a spoiler or a kingmaker at the Democratic convention this summer.

In short, the failed Bloomberg ad blitz serves as a helpful reminder that advertising doesn't actually make people do anything. Ads on YouTube and TV—even when they are released in a veritable torrent as Bloomberg's ads were—are not enough in themselves to convince people to vote for someone.