You missed the point: It's possible, but very unlikely..............
METALLICA, being as big as they are, did not have to take another live act on the road with them, by their own choice. They have always been the exception to the rule..........
Other lesser bands have no choice but to take an opener or 2 with them. They get $$$ from the labels, that are trying to promote, new & up coming acts. Along with Tour support, to help pay for Equipment trucks, crew salaries, hotels, Lighting, Sound, & Tour buses. Or they take out someone, on the same label, to push their exposure to sell more records & increase ticket sales for the tour. But thats the labels band, & money being used. So it's not a viable option to lose $$$, just because some fans, want to see their band play alone. Record Labels & bands are a buisness, & thus have to be run accordingly, bands that lose $$$, tour less, sell less, & fold. When a band can not make money, band members quit or move on. Sometimes management decisions, & money issues, over rule what the fans want, or even what the band wants. Take the OZZ-FEST, all the lesser bands, even some of the newer support slots, are paying OZZY directly, just to get that tour spot. Plus losing more money paying for production costs, in the hopes that the exposure, increase record sales & pushes the band to a bigger status. Even the clubs want openers to draw more hometown people to the gig, & make openers pay to play, & make more on the Bar sales. So your request is a total losing proposition.................Don't open a buisness....................nice idea.....but more like a dream..............