Following Betting Trends Betting trends are a formidable weapon in the arsenal of serious sports bettors. In short, these trends are large scale movements of betting action and basically tell us what the general public is betting on at the moment. They can be expressed in both percentages and actual numbers of bets. Sports bettors find gambling trends useful because these trends can be used to identify profitable bets. One of the most popular theories is that it is profitable to bet against the public.