Hey, I do not know Colombians and Ecuadorians, but we Argentineans have been traveling to Brazil for sex for decades. It is not only about the money, not even about the cocks' size. Our preferences are absolutely subjective, and I recognize that I am very much in love (I am very Argentinean on this point) with Brazil. Brazilian culture is extremely sex positive, exponentially more positive than Argentinean or American, and that is priceless.
However, the prices are really good. In my next trip, I will be spending two days with three GPs, two of them major local porn stars, for less money than one overnight in the USA.