One queen is enough to seed an ant farm. Those are just particularly interesting ants, and hard to get. It is best to just have local ants for farms because then you can release them if necessary, but keeping interesting and exotic ants is more interesting than local types you probably see all the time, especially in areas without a great variety of local ants. 250 dollars for an exotic pet is pretty cheap really.
One queen is enough to seed an ant farm. Those are just particularly interesting ants, and hard to get. It is best to just have local ants for farms because then you can release them if necessary, but keeping interesting and exotic ants is more interesting than local types you probably see all the time, especially in areas without a great variety of local ants. 250 dollars for an exotic pet is pretty cheap really.