Mainly because the FA Cup is one of the oldest cup competitions in the world, and also because it is open to all clubs, whether they are in one of the professional leagues or are non-league.
Watching a non-league team beat a professional side is one of the best feelings as a fan; it really tells us how unexpected a game of football is. As someone else’s answer said, it gives clubs the opportunity to rotate their squad and play their young players, which makes the game less important, which is why it is a big thing if you win the FA Cup because you are expected to be at your best at all times.
And then there’s also the financial side of the game. Winning the League Cup will fetch you about £100,000 while the FA Cup will bring home about £2 million. Not to mention, the Wembley is a fantastic stadium and you really feel proud when you enter the stadium. While the Premier League heavyweights might not think so, the lower league sides have to work much harder getting to Wembley and if they do, they will have done so without world famous football superstars.
After all, football is more about pride and winning, rather than the money. And winning the FA Cup brings you both.
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