Heres the thing you guys arent thinking about. Take someone for example that runs a 12 week cycle, comes off for 8-12 weeks then starts another cycle, the amount of strain you put your body in by coming off for that amount time, your body trying to get its test production up and running again, then just when it gets going, if it even does, you shut it right back down. It is a lot easier on your body to run a low dose, HRT dose, of test between cycles rather then trying to get your body to get its production going again, takes a much lesser toll on your body.
Now this is only for those who dont plan on coming off for at least 6 months in between cycles. If I want to come off and let my body start producing test on its own again, I will take at least 5-6 months. I dont see the point of someone straining over running all sorts of shit to get their test back up again just to shut it back down right as it starts going. Ulter can probably explain this a little better so hopefully he can chime in.