They fought and suffered because Vader wanted Luke. They would have 'won' I suppose if they sacraficed themselves for Luke. And they did actually... Han, Lando, Chewie, Leia all knew that it was a trap for luke when Lando came in and said that Vader was after someone named Skywalker.
So luke just leaping ass first into vader's trap would kinda be a problem for them if we consider how Leia and han shouldn't want Luke to somehow wind up in their situation.
That's what I took from it anyway.