Martingale betting strategy is fail in sport betting
Martingale betting strategy is when gambler double or treble his bet after every loss, so that the first win would recover all previous losses plus win a profit equal to the original stake.
Parlay or multiple bet is second mistake of bettors in sport betting
Parlay is bet on two or more events what are not interconnected. For win bet it's necessary that all wagers were correct. At the same time the all bet's odds are multiplied. Events, where stakes return, are excluded from parlay.
The great disadvantage of parlay is that one event fail and parlay is lost, even if all other events were correct. A positive aspect of parlay is opportunity for bettor to bet low amount of money and win big amount, if all predictions are correct.
Bet money on low odds is fail sport betting strategy
Why do bettors lose money? They have an access to great amount of information about upcoming matches: statistics, situation in the team, weather forecast, the opinion of experts. But the financial result is also negative.
It's important to always remember that any betting strategy has both: positive and negative aspects. Unfortunately, there is no betting strategy what may guarantee you permanent profit. Maybe someone can win money by using a specific strategy sport betting, but it may not work to every bettors.