The Undertaker revealed in an interview with HoustonChronicle.com why he is still in the wrestling business.
"Honestly, I love it, that's why. I've got 26 years in the business and all these injuries, but WrestleMania has become so huge, it's just hard to walk away from it. I want the audience leaving the stadium going 'Wow!' It's a responsibility I have being a top dog in this business. The crowd will let me know when it's time to leave. They haven't yet.
If I didn't perform at WrestleMania, in some strange weird way, I'd feel like I was letting Vince McMahon down."