Well said fly-rod!
Having fished in a few so called "third world" countries myself including the Carribean nations and the republic of Kiribati (Christmas Island), I can say that they will always be my first choice when looking at a fly-fishing destination. In Mexico the Bahamas and Kiribati I have witnessed a very strong appreciation for the value of recreational fisheries. In many ways they do a better job of controling commercial exploitation of the resource than we do in the USA - and as you correctly state, these people fish because for many it is their only source of protein!
I myself have not fished La Republica Dominicana but I would never pass up the chance to fish any Carribean location given the opportunity. In tropical waters you just never know what's going to come along and eat your fly