I'm going to beat you over the head with some Lore
Ferengi are actually really intelligent creatures, and have technology that rivals the federation, they just don't usually make war because that's less customers. They do have a military, but it's primarily to protect their interests and assets.
Rom as a Grand Negus took fereginar into a new direction, with the possibility of federation citizenship latter down the road. Nog was also an outstanding cadet and paved the way for future ferengi in star fleet.
Side note: The original purpose of the feregi was adversarial to the federation, as anyone who watched TNG would know, but they seemed kinda silly to most people so they re-introduced the Romulans and the of course the Borg.