Blockbuster could have bought Neflix for 50 million. 

Netflix is now worth 40 BILLION ! ! ! 

But the truth is, Blockbuster could have never made Netflix what it is today. 

For example, Flickr would very likely been "Facebook" if they never sold to Yahoo.  Flickr was an entirely new concept were people can post pictures and comment on them, but they sold to YAHOO and that was their demise.