Hybrids rarely have seeds or have very few. It's like when a horse fucks a donkey and has a mule. The mule is more durable than either of its parents but it's sterile and you can't just have it fuck another mule to make more. If you breed two different seedy plants you will likely get a daughter with lots of THC but no seeds. The power of reproduction went into making THC, but it's a one shot deal unless you clone that plant.
i'll use some mid seeds for this, but my headies are for some more hands on cultivation. BTW: I have lots of seeds(20+) from headies because the guy i get it from requests them so that he can grow his own.
My friend has been saving all the seeds from high grade mids-nugs for the past year. He is going to start growing soon.