The Mayweather Effectwas it always like that?
muhammad ali lost 5 times.
the fabolous four of the 80's are still remembered to this day. obviously they had to take losses when you do a round robin like that.
Floyd built a legacy on the fact that he never lost/loses, held it dear to himself, and became (arguably) the biggest star the sport's ever seen. The amount of people who "watch boxing" but ONLY know Floyd Mayweather is astonishing, particularly in the mainstream media.
Before that, the biggest star in the game at a particular point had all lost. Roy Jones lost. Oscar lost and was still the top draw in the sport afterwards. Tyson, Holyfield, and Lewis all lost and were still at or near the top of the sport's popularity. Now that game has changed.