Not coming from a fan of Mayweather, but GSP was PPV king for the same reasons Mayweather was a PPV king despite not being known for knocking people senseless. And I know there are major character differences between these two icons, but nonetheless, GSP was the ultimate well-rounded athlete the sport of MMA (in a cage) has ever known. Fights intelligently, wins more than consistently... constantly...5 round title fights, against deserving contenders...Not likely to necessarily attract the same audiences as Mayweather...not the same image...GSP is known for being a nice guy, got a great image, work ethic and is respected by all athletes within the world of MMA. Back in 2004-2005, he used to convince MMA noobs that they were watching a sport.
Now, about being boring, listen...I'm the biggest Wand fan out there, but GSP's style is more likely (and that's unfortunate) to make a career last longer, and prevent him from ugly losses when things get too wild. A guy who wins 10 in a row by taking guys down and dominating them on the ground without getting hit gets leverage to get a better contract, make serious money, then negociate PPV money - while staying healthy an not taking all sorts of damage. Keyboard warriors call this boring and fighting like a pussy, but the reality is, most people are more impressed by a guy who consistently performs well than a guy who fights like a berzerker and loses once in a while, and ends up washed out at 33 from being in too many wars.