Ive found that the biggest stakes tend to be on the markets with just 2 results… In football Asian Handicap being the biggest, but also goalline, over/under goals… rather than 1×2. So promoting bookies who have good coverage in those markets may aid your chances of picking up whales!
Picked up a big hitting Tennis punter – I hear there are quite a few of those out there – again larger stakes becuase of the 2 results I expect.