i have been playing live betting sports and casino for a long time i can say it really do help me at some point it manages me to recover some of my losses i am using martingale in casino games but it needs quite a lot of bankroll for me to win and in regards with sports betting good review and good reviews of the team in order to win from it. so far i can really tell that even if you are using any kind of strategy either your own strategy or known strategy there is no guarantee that you won't be losing.
Very risky but if you are good in managing yourself especially your emotions, martingale can give little chance to bank some dcent profits. While with sports betting better to relied with games that you are very familiar with as you can check and balance all the stats and all the advantages of those teams that you will going to place your bets.