Pretty elitist view. Do you think there's no point in cheering for Brighton, Wolves or Palace then? They certainly play/watch each game aiming/hoping for a win. But in regards to the full season, there's plenty who's goals are much lower than winning the competitions. That goes double for fans - 90% of the teams don't really ever win trophies. While footballers are highly ambitious by profession, fans watch to be entertained. I still remember the win of TSV Vestenbergsgreuth against Bayern in the mid 90s. Did they go on to win the competition? Certainly not, but I still remember their win 30 years ago, though couldn't tell you who actually went on to win the cup back then.
