Tinkering with the Demo is not the same as actually building with the product using new templates (if I get them).
Ah, but it's not a demo, the 30 day trial download is not crippled in any way. The software is not template driven at all. While templates are nice to give you layout ideas and learn from, creating your own layout design is always going to be preferable to creating a site from a template. In all likely hood you will end up with a site that looks the same as someone else's who also used the same template.