How far away does a concert you'd wanna go to have to be before you don't want to go to it?

Most concerts I've been to that have required travel outside of my home city have been 1000km away and I always fly. This has probably been about 10 times all up, 4 of which were festivals with multiple bands I wanted to see. I have yet to travel to another country for a concert but for a very few specific bands that's not out of the question. There's probably only a couple of bands that haven't toured here yet that would actually be that tempting.