I know for a fact Mark's management has been contacted several times by brazilian promoters and the demands were absolutely ridiculous. He doesn't wanna come so the easiest way out is to make it look impossible, that's my understanding based on what I heard here.
Absolutely ridiculous?
MK tours many places in North America and Europe, in Spain, for example, they play about five or six concerts sometimes in cities where it's not that common or rare someone like MK plays there so, the demands to play in South America are ridiculous but to play NA or Europe, their demands are more normal?
Actually, the Spanish promoter said in an interview once that MK and his manager are not more difficult on their demands that any other artist, in the contrary. And some big names goes to play to Brazil...
Maybe is just is too expensive for MK and their band to travel to certain places, hence the demands... but, other big names plays in Brazil so...