#2 Tag matches are more exciting
When you watch a wrestling show from any promotion, you'll find that roughly half the matches are tag team contests. This is no accident, but an acknowledgment of how much fans enjoy tag team wrestling.
Tag teams allow the promotions to give air time to four athletes instead of just two (or more in the cases of triple threat or four corners tag matches). Also, getting more characters and personalities involved in the contest creates greater drama and therefore a greater payoff when the match reaches its epic conclusion. Adding in the MITB only magnifies this effect.
Edited by Arvind Sriram