Amateur/HS sports are what they say on the tin. if you want to watch your cousin in a daytime soap fine, I'd rather be watching Anthony Hopkins as Hannibal Lecter or Ian McKellen as Macbeth - I want to see the best and that's what pro sports give you. To see Gareth Bale in full flight running at Olympic speed while controlling a ball, Cristiano Ronaldo rising like a salmon at the end of perfectly timed run he started 30 yards ago, or Lionel Messi ghosting past the opposition is a wondrous sight.
Sure I'll go and watch a match at a lower level and it may be very exciting but it will lack quality. You see it between World Class players and ordinary Premier League players and then between PL players and Championship players ... and if you don't you're not really watching.