I can only think of one or two times when an opening act (one that I've never heard of prior) has left a good impression on me. Most of the time,in fact,the opener is flatout terrible. Is this a plot by the headliner to make themselves sound better?
Go to more shows. Every artist/band starts out as an opening act to somebody.
In Spring 2009, I went to the 930 club to see Kid Cudi. Kid Cudi was the headliner, Asher Roth was the second guy to perform, and some guy named either B.o.B or Bobby Ray -- or both...it was quite confusing at the time -- was going on first.
The only thing -- I repeat: the only thing -- I remember from that show was this B.o.B or Bobby Ray guy performing this song about a Satellite. It was mindblowing. He brought the house down. I remember nothing else about the show.
The next day I googled "Bobby Ray Satellite" and BOOM what do I find but a mixtape called B.o.B vs. Bobby Ray that includes a song called "Satellite. The mixtape is amazing, and it turns out that he has five other mixtapes out and another one on the way. For the next six months I listened to very little but Mr. Bobby Ray Simmons Jr. And I still content that his mixtape material is better than his album material. And I'm not a hipster either.
So that's why you listen to opening acts.