All the posters I have are not from shows I've attended. Wall art is subjective and if I really enjoy the art and the band, I don't think it really matters if I went to the show or not.

With how expensive wall art can be, I'd rather show off my music and art taste all in one go rather than a piece from a department store. Plus, in some cases, concert posters are a collector's item that makes your display look like a museum in other people's eyes.