remember , a lot of colonies which you can buy from other keepers or shops , are from nature. In nature Myrmica is making big areas , where live a lot of colonies which feel like one big colony (like fire ant).
Keepers or shops which selling Myrmica , only get some your buy notice like "I want 4 queens and cca 200 workers" ... then keeper come to nature , and get it easily from this big area-colony. I am making it so too. In that big colony in nature are layed some eggs which are prepared to be fly ant , so when is keeper getting it , he getting also these eggs/larvae/pupae. So this is why are you have in colony fly ants. It will be only this year , next year I believe you will have only workers

and first real your males/females you will have only when will be colony so big
Skippy