Ionic Platform Docs
docs.ionic.io
docs.ionic.io
"Ionic is currently in alpha testing and is free during that period. We will announce billing information and pricing plans in the coming months as the service matures."
I guess the adage applies -> If you have to ask the price, you probably can't afford it.
More likely is that they'll offer support contracts, a pay for IDE and build services. Which if you are making money with your Apps then it provides assurance to you to pay for those things.
Looks like I figured out what went wrong before and got it running on my emulator and my phone now. Gonna try building something on it.
I'd say that unless you have some very talented developers and you aren't having to worry about cross-browser issues & commit to exclusively mobile apps, avoid Ionic. There are many pitfalls when you deviate from opinionated conventions, and they can be quite painful to figure out. I spent an hour earlier today trying to figure out an issue where registering a new user was broken due to the new Ionic view caching mechanism - this is quite painful.
I would highly recommend waiting for Ionic to hit 1.0 formally before even considering using it to anyone who is still deciding - you'd be better off probably going with Angular Material instead currently. I don't normally advocate staying away from a pre 1.0 release, but with Ionic, I think the warning is well earned - this is also coming from someone on a team where Ionic fit our use case almost perfectly, but were bitten hard when we had to do desktop support along with mobile & various other issues from our design not matching up with how Ionic built things.