The thing about the Big Bang is the first time you go it is THE funnest place!! The 2nd time you go, you're thinking to youself, wow- are all the same people requesting the songs again? Hmmm... so you decide to come back again a month or so later right? You may think it's going to be different and then you hear it... 'I've got friends in low places'... yep here we go again!
It is a lot of fun when you go with people who have never been and the alcohol helps of course. I went a couple weeks ago and I am NOT kidding when I say they played about 4 new songs! They must have to practice for months of course before they feel confident enough to play in front of drunken people wanting to sing along. So I guess my word of advice is, go every 4 or so months and maybe you'll get to hear new stuff or it will have been long enough that you forgot the set list.