That's because 4/130 is not a playoff, especially when undefeated teams get left out. That is an invitational. There has never actually been a national champion in D1 FBS level football and the NCAA does not directly crown one. There have only been mythical titles claimed by schools after winning bowl games.
MLB used to have 8/30 make the postseason. This was a reasonable number and it meant that making the postseason was somewhat difficult and meant something. That's the number it should be today.