I have done this both ways. My insurance "covered" therapy while I was with a provider to begin TRT. Then, as often times things do, the provider left my area. So I was lucky enough to find an age management doc close by who was trained and knew his stuff. His cash only system worked out to be comparable, in fact cheaper, due to a shorter commute versus the original doc.
I will also add that I spoke with IMT (and more than likely will be speaking with them again this summer) and they were also comparable to my "covered" doc. The big difference is these guys know the latest in age management/trt so they can tweak our protocol MUCH more effectively than a primary care doc who we often times have to train and sell them on the latest methods to successfully manage our condition.
So even if it is a little more expensive for arguments sake, consider the value of the knowledge and convenience of a place like IMT. I know I sound like a mouthpiece for these guys, but I'm really not. Just my two cents.