Them as in the band or promoter?
I have no idea, but as already stated it's up to a promoter to book gigs and bring them to yours and my country, obviously they are in it to make money and the band aren't going to be doing it for free either.
I don't know how it works these days, it can't be purely on sales, as no one sells anymore.
I have no idea where you're from, but last 18 months in Australia has been incredible for bands touring.
It could be our high $, or really good promoters who know our small market for metal.