Regardless of how good or bad you think they are now,you are saying that if you were at a concert "doesnt matter who is playing"and you had a great time and loved the show you wouldnt be tempted to get a cd or dvd of that concert if it was available to you..
Not everybody will want one but for the people who do still think they are great how could that be commercially terrible its not that expensive and would prob have a better profit margin than the T-shirts