Here's one fact for ya - The ProV1 was and still is the best selling ball worldwide and has never used the principle of fitting to a specific swing speed or player. It has been sold on the principle that fitting a ball to swing speed is a myth. Hmmm....so they've been wrong all the time eh? Or maybe I'm the one in denial?
The ProV1 IS the best selling ball: because Titleist has numerous tour pros on the payroll playing it. Anybody with money to burn or who wants what their favorite pro uses is just going to buy a ProV1 because they see the pros using it. I use the ProV1x currently because I have done extensive testing (in 2013 when the new version came out) and found it suited my game the best. When the 2015 ProV1 comes out I'll do the same testing and pick the ball that again will give me the best numbers, regardless of the brand.
What I'm saying is the ProV1 has been sold on the principal that the more money you throw into marketing, the more people will buy a product.