OK SG, since this is apparently a difficult topic for you I'll try and explain it so you can understand it.
Fans are happy when teams sign good young players to long term deals.
Happy fans are more likely to buy season tickets and buy merch.
TV ratings are higher when fans are happy.
Sponsors and advertisers are willing to pay more money when a team is popular.
I absolutely think that the team's revenue stream is higher today than it would be if they hadn't extended those players.
You'd have to be a complete moron to think otherwise. The only question is, how much more revenue will be generated.