Why the Star Trek movies need to use the Ferengi

The Ferengi are not nice looking bad guys. They live on a humid planet and they NEED to be in a future movie or TV series. The Ferengi are symbolic of Capitalists. They think 'Greed is Good'. I don't know why they haven't been used yet. They could make a movie where the Ferengi and the Klingons are at war