It's because this is the pinnacle of body building, to be crown Mr. Olympia. As we have seen names that is famous who held this title before. So I would say that Samson will also be as popular if he can maintain and defend his belt next year and the next.
I'm not familiar with Rubiel Mosquera though, as I'm a old body building fans way before, so I would say that my favorite Tom Platz. Maybe some of you are not familiar with him because his contemporaries is Arnold and other great body builder of the muscle beach era.
I don't like the idea of promoting open bodybuilding and rewarding its contestants with lots of money because open bodybuilding is very dangerous. People shouldn't be motivated to prepare and participate in open bodybuilding because this division with its participant and physique, automatically promotes a huge abuse of performance enhancing drugs. There is a reason why Chris Bumstead doesn't move from Classic to Open bodybuilding. The necessary dosages to compete in Open are very high compared to Classic bodybuilding. They take on test, hgh, insulin, peptides and what not.
I'm familiar with Tom Platz, he is a legend, known for his big legs but regarding to this, I prefer Jay Cutler, his famous leg flex moment is amazing.