You must be too unlucky to lose twice or three time with 80% chance at first bets you make. On long term surely this consecutive loss streak comes, but for the first bets it's very hard to happen. All you need to do is to win once with these configurations, one bet win is sufficient to make a big profit and enjoy it. Some gamblers like to do the inverse, lower chances to win, but bigger reward multiplier.
You can even loss the first time. What if you lose the first time ? You think it won't open untill only the second or third but if it happens the first time it will hurt.