Just some random advice from the internet:
Pricing at $1.00/month means that new customers + retained customers - non-collections = 200, $10.00/month means 20, $100.00/month means 2, and $2400/year means just one.
It's harder to acquire 200 customers than 20. It's harder to retain them. It's more work to process their payments and more costly due to per transaction fees. The channels that are used to reach such customers have to be lower cost and generally that equates with noisy -- think of app discovery for $1.00 apps in the appstores -- and $1.00 services are always directly competing with free.
I was going to say "web hosting/email", but then I realized that I wouldn't really trust a $1.00/month web hosting or email provider because at that price it doesn't suggest a sustainable business, and if it goes under after eighteen months, the pain isn't going to be worth the cost savings.
Pricing is signaling.
Good luck.