As they shouldn't, he hasn't earned it. He took a dump on the face of the best talent on the roster and said "fuck you, I don't have to do SHIT but show up and pin you after you carry the entire program". Disrespect begets disrespect. Undertaker is a selfish, arrogant, broken down old has been who can't give it up, who doesn't give one shit about the next generation of stars and helping the company that made him thrive. It's always all about him.
Some of the best in the business got their start with being great sellers, take Steve Corino for example. Started out as a sidekickish Heel that antagonized the Main Eventers but always got his ass kicked and eventually had a Face turn push and became ECW Champ.
Maddox actually reminds me a bit of Corino minus the mic skills.