I’ve followed Top Racing Tips for over 2 years. It’s incredibly profitable at a high ROI but you will lose accounts quickly.

Tips are posted the night before and cover flat racing in the UK.
Stakes are 1-2points generally and can be up to 14 units in a day, but on average around 5points.

Due to the very high number of followers (around 600) prices go very quickly the night before on sportsbook when the market has no liquidity. There’s plenty of warning so it’s possible to follow, but this will lose your sportsbook within days/weeks which is the only negative I can see.

I’ve managed to keep following by taking the tips at morning prices and still find this very profitable.