Hey @Ray_of_Light, welcome to the Community 
The webflow.io domain (called a “staging site”) is limited based on the Account plan you’re on. Just like you mentioned, the free Account plan has a limit on these staging sites of 2 static pages and 50 collection items. If you pay for an Account plan, that limit goes up to 100 static pages:
Other than the Account plans, there are also Site plans which are added per project which give you the ability to attach a custom domain, remove the “Made in Webflow” branding, and have different page/collection limits than the staging sites (based on the level). For the Basic Site plan you get 100 static pages but no collection items, with the CMS and above Site plans increasing the amount of collection items:
One thing to note regarding the templates and staging sites—the page limit is essentially ignored and you will get access to the amount of pages included in the template you choose/purchase. This means that if it includes 50 static pages, you’ll have access to all 50 static pages, even on the free tier. That said, you won’t be able to add any additional pages so you’ll either need to make due with what’s included, add a Site plan, or enroll in an Account plan.
Hopefully that helps clarify things a bit, but you can always take a closer look at all of the different plan limits and pricing at the link below:
If you have any other questions, don’t hesitate to reach out 