And this 10% profit is the problem! A whale make deposit, he places few bets and with 10% profit he can be satisfied, and when someone little deposits $10 and make 10% profit it's nothing, so copying bets from high rollers will not work, you will have to make an extra effort and try to make higher profit if you wish to be satisfied with the money you won. Of course, you can try to be patient and to set up a 10% goal for the day, and 10% every day can make you a nice amount in some time, but many tried that and got busted along the way. Don't forget "the seed", some people play with bots, and they change their seeds after certain number of bets, so copying bets doesn't have much sense when you play on different seeds.
Maybe this copy bets strategy can work with sport betting, but you need to find a high roller who is willing to share his bets, just that!