Today TUS tournaments aren't popular at users. Tournaments are held seldom, most often in tournaments participates to 8 players.
The main reason for refusal of participation in tournament is duration of this tournament. After all to play this tournament (on 32 persons and more), a lot of time is required. And in online (on WormNet) there is no such number of players.
The main difference of a cup from tournament is, that in a cup there is a group stage, and anything more. In other words, I don't see a special difference - a cup it or tournament. Only in the name. It is always interesting to participate in tournament where there are a lot of players or top players.
At desire tournaments too can be classified on one-day and multi-day. Both with SE, and with DE carrying out system.
I suggest to arrange seasonal tournaments in a TUS site. It have to be mass tournaments. 64 persons, or even 128 have to be registered.
On a site there is a function, allowing not to allow before participation in tournaments of inactive players and there is a Deadlines function, the organizer of tournament has an opportunity to give out yellow and red cards.
I don't suggest to take and at once to allow to create such tournaments. Let's try? Let's create one, we will look, what from this it will turn out? Maybe Winter TUS Tournament - 2013 is elite, Summer - TTRR and ...