Upload & Sell: Off
Paul probably sells a lot of lights, but no one monitors who sells the most gear. I spoke with Profoto about this a couple years ago and they had no clue what their market share is. Paul has a private company and has no obligation to release his financials to shareholders.
There are not more Einstein modifiers available than any other manufacturer. Almost every brand can use third party modifiers with the appropriate speed ring, be it Mola, Photoflex, Chimera, you name it. I'm a Profoto owner and used to own Alien Bees - and I really liked them. They have a small footprint, are easy to use, inexpensive and a lot of features. But they had plenty of cons to go with the pros. I much prefer Profoto for the way in which I personally shoot. Monolights have their place. My personal favorites were the old Hensel Integra's. They were built like tanks, yet still light-weight and they worked for years without a single issue. I regret having sold them.