The result? Those persons are now broke , divorced from their wives and are miserable right now. What I want to say is that a strategy can only work for a very short amount of time and not in a continuous way.
These people do not really do any serious analysis of sports events, this is not something what's you should do in the coffee shop by drinking and smoking all day. I agree that such people do not have a great chance of winning, if we compare them with serious players.
Serious player is person who have money, knowledge, and determination to succeed in something - and if you have all that, still you need a plan how to play/invest. For example if player bank is 1000$ ( it can be 100$), simply strategy for me would be to bet 100$ per ticket, max 3 events with odd around 10.00.
The reason for this is very simple - you have 10 tickets to play, and on each ticket you can get 1000$ of profit. So if you lose 9 time in the row (900$), and win with last ticket, you will get your bank back.
I try this method many times, and worst result was 3/10 won ticket, and best result was 8/10 won ticket.
In conclusion, if you are not capable to win once in 10 times, then it is better to leave betting.