Good question. No doubt Mak looks amazing - I just looked at his pictures - though they were only the thumbnails since I am mere plankton in status here and can't get the full sized.
But size/mass seems to command immediate attention and respect somewhere deep down in the primitive reptilian portions of the brain - it is usually the biggest animals that dominate, etc. Of course, humans have other qualities that are respected, but since we are animals, we still retain this aspect our evolutionary history - an instinctual deferrence to the physically dominating. So, know one ever fucks with you if you are as big as Mariusz.
And you have to admit that all body builders are exihibitionists to some degree. Which brings up another point. If you look like like Mak, and you put on a sweat shirt or and long pants, you look like pretty much every other schmuck, if they aren't fat, - well maybe a little better. So, say you live in friggin' Minnesota or something and wear a coat 10 months out of the year. All that work and struggle and pain and you cover it up. But Mariusz could wear anything and you can still see his one giant muscular dude. So, I wouldn't want to be Mak unless I lived in the sun belt or something and could walk around without a shirt half the time.
Plus, Mariusz can eat a lot more!