what about a simple one time purchase? I imagine the half life of a good pitch is really short. So your churn will be high. If people last a long time on your service, they have other problems.
A monthly subscription is just another thing I need to manage. Also, I feel like I am paying for a time where I may not be using it yet (there's a time delay between setting it up and actually going out to investors).
And the jump from $89 to $199 just for a CNAME is a little high as well.