The pricing for individuals is gonna be published soon along with the SaaS product. It's probably gonna be something like $10/mo but still couple more features need to be built to justify that (like permanent links which content can be edited)
As for the $100/mo - we do have business/enterprise customers who find lots of value in it. I guess the price has been initially verified by the market so should I justify it?
I guess I can justify the price by saying that the project has taken numerous hours of engineering, testing and experimenting. I think this is natural in pricing models that bigger customers pay more.
If you can do the same in a week than good for you.
Peace and take care :)