Yeah, last year's Wrestlemania drew over 50,000 fans to the Skydome. Probably bigger than any crowd GnR drew during their US tour.
wrestlemania draws a way bigger crowd than anything gnr played to in 2002, they set attendance records for stadiums they held it in several times in the past few years, attendences of about 70000, this year its at msg so the crowd wont be as big, but the worldwide tv audience for wrestlemania is enormous, whats more the target audience is young males, which, if we're being honest is the same target audience that guns will be looking to make an impression on, as much as it would have disappointed a lot of us if they had chosen to play at wrestlemania, it would have been fantastic media exposure for the new band