Rx-8 heads up?

I have two different friends looking to get into rotaries. And since there’s no fds for sale in our area, they were looking at rx-8s. I’ve also been curious bc I want to learn how to take care of a rotary. So is there anything that we could learn that anyone wishes they knew sooner? What does it take to get started with an rx-8? And are they really as expensive as ppl make them out to be?