Your customers should be able to subscribe to your space without you having to transfer ownership. To allow such a feature we've implemented a checkbox that you can check to allow particular users to access the subscription area of your space. This will not make them an admin or allow access to other settings. To enable that, navigate to your user tab in your space settings and click on the cog icon on the right side of the user. There you will find the option to allow management of subscriptions.