It's not really a match type, it's chosen by a wrestler, or a higher power(GM, Vince, Board of Directors, etc.) if the wrestler wants to put his wrestling career on the line, which is usually for something of value, like Jericho vs Ziggler for the Money in the Bank briefcase. It's not a match type, it can be in any match type, like Undertaker vs Edge in a TLC match, a career vs World Heavyweight Championship match was the part of the match. Although, I do remember, Batista left WWE right after losing an I Quit match with John Cena, but it was never a stipulation that they had to leave WWE, Batista left out on his own.