I have no idea what you're offering when I first look at your website.
I would remove the word "hack" from the single line at the top. Most people associate "hack" with bad things.
Your form at the bottom of the page is too spaced out.
For the frequency type, I'd change it to a drop down select in order to streamline the backend of the service.
I wouldn't make the customer pick their own question to be asked.
I think you can operate around a 50% profit margin at $10/month.
Worker costs: $8/hr * 8hr/day * 30 days = $1920/month So breakeven is 193 subscribers at $8/hr for your caller.
I estimate each call will take approximately 1 minute. So your caller can handle at maximum 480 calls per day, but more likely 400 after breaks.
So at capacity for a single worker, you have 400 subscriptions, bringing in $4000/month. Your cost for the employee is $1920 per month.