Let me throw more light to what you are saying here; the thing is we don't have professional or public bettor,
Yes we have, just like you have professionals employed who make the odds there are also gamblers who have made this a profession, and you have
-gamblers that focus on the odds movements and bet on exchanges just like some trade cryptos: like
https://www.betfair.com/exchange/plus/-gamblers that focus on timeform much like tipsters that will play only when the right combinations of odds and timeform pop-up
Throwing money at one event is not making you a pro, it makes you a whale, and whales are not known for raking proiits!
Hobby bettors gamble with the intent of winning each match they put in, professionals are gambling in a way so that they win more than they lose, chasing not the favorite but the value behind the bet.
Would professional bettors even allow you to follow them and make the same bets as them?
Just as with copy trading, there is copy betting, plenty of guys doing it, and your choice on tracking the right guy at the right time.