I suspect what's actually happening is that they are playing lowest-common-denominator music, which few people are thrilled by, but which more people are interested enough in to stay listening to.
Put differently, there are lots of people that might listen to Latin American music, and very few of us who listen to prog rock. Prog is actively repellent to ~90% of people.
Put differently, there are lots of people that might listen to Latin American music, and very few of us who listen to prog rock. Prog is actively repellent to ~90% of people.