Really? Lack of opportunity? Lack of interest?
You may have missed your window. Concerts used to be pretty affordable, but now they're all pretty expensive and they sell out in a couple of minutes because scalpers buy them all up, so you have to pay even more to buy them on the secondary market - at least that's my generalization of most concerts nowadays.
I definitely agree with you on the standalone concerts. Outside of music festivals, free entertainers on cruises or in restaurants and bars, the BBC, and the "free" concerts I go to as a Universal Preferred Passholder (and I've seen some really good ones the past couple of years in Barenaked Ladies (some of the best entertainers live), All-American Rejects, Foreigner, Lynyrd Skynyrd, Steve Miller, Pat Benatar, and I'll be going to Pitbull, Goo Goo Dolls and maybe Huey Lewis soon), I never go to standalone concerts.
I was really tempted to see Weird Al in Mobile soon but all of the tickets sold out quick thanks to scalpers. Now I would have to pay $80-100 to stand in general admission.