Hi Ewald,
1) I have to design 5 homepages with same layout / style and different content (but all pages from same organisation, pages will be implemented as CMS in different subdomains) – do I have to buy the theme for each page, or can I buy it once and use it for all CMS?
==> Yes you can use our theme for many other site but the support will be only for one domain.
2) I read something about 15$ costs / year, but behind in brackets “optional” – what does that mean?
==> When you buy a theme then you can get one year premium support. After one year you will not be able to download the updates and post forum question in our premium support. But you can use our theme for life time. If after one year your subscription will be cancelled and if you still need support and updates then you need to pay $15 to activate for new updates and support for next one year.
Thank you!