Development spaces created through your Storyblok Partner Portal have the following benefits and limitations.

Benefits

1. No amount limit – create as many development spaces many as you need.
2. You can provide access to your portal to an unlimited number of team members: Learn how to invite team members to your Partner Portal
3. Revenue Shares from your customer's subscriptions: Learn how the revenue share of Storyblok works

Limitations

Limitations will be lifted once subscribed.

1. Limited to 10 publishes per Day. (Resets on the GMT time zone.)
2. Higher Limit on Content Delivery API Draft Requests.
3. Only one collaborators can be added to set-up billing.

To lift those limitations or if you want to add your customers to your space you will have to subscribe to that space. To do so, your customer will have to choose a plan.