The short answer... as much as you want!
As a Youspired coach, you can set your subscription fee. You can charge what ever you feel your valuable content is worth.
All you have to do is ensure that you are charging the best monthly subscription amount for the quality and quantity of content you are producing.
An easy way to lose subscribers is to charge a large monthly subscription fee and not deliver the value that your subscribers are paying for.
There is also a minimum amount that you must set your subscription to. The minimum you can charge per month is $9.99 USD.