Well, The Shark Cup is certainly got that 'Best of the server' feel to it for anyone playing at the top of the server and there's a lot of big ties each round as some of the best teams by quality and history go head to head for battling to be the right for to be the "server champion"
But lower than the Shark Cup it's basically a 'Royal Rumble Cup' where it's just a fight all the way against similar quality teams and the object is just to try and survive to stay in the competition as best as you can.
At the end of the day, Your a Football Manager/Chairman of your team on this game, You have to decide what is best for your team and that includes forfeiting tournaments to concentrate elsewhere or to tank a season.