Possibility? Yes. Probability? VERY, VERY slim!
I'm glad you're beginning to realize just how hard this is. Only about 1% of people who bet on sports do so profitably. YOU are not one of these people, and neither am I. The difference is, I've accepted this fact, and I no longer throw my money away on sports betting.
I am not an expert on sports betting, but I know a little about what these people do:
These folks spend hours and hours each week analyzing statistics, players, conditions, teams, and betting lines. They come up with a handful of "high percentage" picks on which they place their bets. They never bet more than a small percent of their bankroll on any single game because they know there is NO SUCH THING as a "Lock" in sports. ANY of their picks might lose on ANY given day. Anyone who tells you they have a "Lock" on a game is either lying to you so they can sell you their picks, or is an idiot, or both.
These folks are, above all else, DISCIPLINED! They are disciplined in their approach to making picks, and they are disciplined with their bankroll.
I'm sure they have a method by which they make their picks. They might call that their "system". What it really all boils down to is this - THEY have the same information as the people who make the lines. It comes down to finding what they consider MISTAKES in the line. A football line is listed as the Patriots -4, but they are convinced that the Patriots really should be around -2. So the bet on the team against the Patriots plus the 4 points. They figure that around 60% of the time they are going to be right on this one particular pick, and that will give them enough IN THE LONG RUN to make a profit.
Here's what most people do - they see a team that they KNOW is going to win, and win big!!! They are "sure" of it! The line is -10, but that doesn't matter to them. They are so sure this team will win big that they bet 50% of their bankroll.
With 42 seconds left in the 4th quarter, the underdog is behind by 11 points and is going for a 48-yard field goal attempt. The kick is up.........
The outcome just doesn't matter! My point is they might win and they might lose. These people are flying on emotions and whims and are clueless how to find a high-percentage play. I am clueless how to find a high-percentage play, but at least I finally have accepted this fact.
Both SportsBettingInsights and Vegas Matt beat me to the posting. Both of those are excellent posts that are saying similar to what I said, but more clearly and more simply said!