#2. Influence among higher-ups

One of the things that really irks fans about Brock Lesnar is the fact that he has such clear influence among the higher-ups, particularly Vince McMahon. Now Jim Ross himself has stated in the past that Brock Lesnar is an intense negotiator and is always very open about what he wants.
Moreover, he has a lot of leverage as compared to other WWE superstars. While McMahon may not like superstars using such leverage from a company perspective, he certainly understands that it will be used if they have it.
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Think about this - Brock Lesnar is the only superstar in WWE who walks out with sponsors on his trunks. He seems to be very demanding and more often than not, Vince McMahon is happy to oblige. That's probably one of the reasons why he gets paid so much. Also, it's likely that McMahon likes the brutally honest character that Lesnar is.