I admit I left after the "mid-credits" scene. I stupidly thought that was it and that there'd be no further tag.
I also figured that if I missed something, I'd see it eventually on BD so it wasn't a big deal!
No - it was on about 2100 screens in the US, and it ended up with a total gross of $25 million.
The "Whedon fanbase" explanation can be discounted because the "Serenity" take shows about how much Whedon can bring in at best.
Whedon's name is good for a little money, but there's no...
I think Banner means he's always angry but he's able to control it - unless he wants to let it out, which means he can turn into the Hulk at a moment's notice. He doesn't have to be made angry - he just has to allow himself to drop his self-control...