It never hurts to ask for specific songs that reflect your taste. But again, "we " to a greater or lesser degree, need to cater to our audience ( even requests ). If I have an audience that is somewhat new to the scene, then my dura will be introduced over the period of the gig. Here's a situation where the format could be much more in the Romantica stylings. Certain clubs in Tampa, cater to that style, but, primarily due to the fact that , the majority are older Cubano's . The most successful DJ there, was a Cuban radio DJ with a large following. So much so that, when he quit, the club closed within 3 months ! Salsa radio stations are also driven by program format ,and there are stations that lean more to hard core and, as to Amazon, they have found a market for their selections, plus a lot of that is very old, and subsequently cheaper .