The new Tuning platform works on a pay-per-use basis. When you purchase a license you are buying one custom generated theme pack, with an unlimited usage license. (read full license details).
This means that each purchased configuration can be applied to an unlimited number of websites.
Themes are categorized from Basic to Premium, and prices depend on the category of each theme.
When you purchase, let's say, a Premium license, you can then customize and download one custom pack for any available Premium theme in our themes list.