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I remember a guy who posted here in the forum that he made $90k from just $4k by following the pattern of betting with all the money won from the previous bet in the next bet, and when he made the bet with $90k, he lost it all. He also mentioned that he had made about $400k once using the same pattern. I don't understand what's the point of winning so much money if you are losing it all at the end of the day and aren't using it for something useful in your life.

A lot of gamblers manage to win significant amounts of money with just a small amount but they never stop and withdraw that money but lose it all again to the house, such wins are basically useless unless someone learns to control their greed and starts practicing the perfect time to stop when gambling.
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You can bet incorrectly and even win by luck for a long time, but not indefinitely. That's one reason why many people believe they can analyze the market and the teams.

Do you truly believe that you alone can consistently outperform the full-time analysts hired by bookmakers to set the odds?

Only a very small number of professional bettors can eventually achieve this...a very small number.