I've never been to a classical music concert where there's been an encore, either. I mean, if the programme is a Beethoven quartet, a Shostokovich nonet and a Debusy piece, all performed by different people, what's the point? Ditto for a Poulenc gig I went to; if you go along to hear a bit of Poulenc, WTF do you want for an encore? All the concerts I've been to are like that; a pre-announced bunch of pieces, or one piece.
I guess it's different if you go to see a recital by a pop group like the three tenors, but I've never gone in for anything of that nature in classical music terms.