Re: Songs that suprisingly have a huge number of hits on YT. Ex Cranberries - Zombie
Keep in mind that a lot of "hits" aren't exactly earned, but made by a marketing firm. Take away the engine to market something, all you're left with is is independent discovery methods and word of mouth.
Then factor in how many songs get over-exposure, how many people get their fix on a new good song to the point they no longer care to buy the CD to boost the charts. Remember, Billboard historically was based heavily on sales, not on requests, and the requests when factored in were limited because these radio stations weren't answering all calls and keeping these records. Those numbers were mostly made up WHEN they finally started to get factored in.