Whatever their motivations, you can be sure winding up the regime will be among them. And, I dare say, curiosity and genuine interest.
I also don't doubt they'll be under severe restrictions. Not just access to the rest of the country outside of their hotel rooms and "escorted" tours of the city, but in what can and can't be said and performed. I wonder if they take that as an aesthetic challenge.
For years, people whinged about Laibach being "Nazis". Maybe they just miss the good old days of controversy.
And maybe they're just in it for the money. All that counterfeit US lucre must count for something.