Improving the current template is another way of making other templates because ability to rearrange blocks, columns, headers colors and fonts is the sure way to whip out new formatting with the same template.
It would help to have a video and a written tutorial which show how to do this. The point is that from one template, if one is shown how, one can create unique other sub-templates or varied themes. A super tutorial could show two radically different sites which were created using the same template. People just need to be shown how.
Even if one selects from a template from a developer who offers one hundred templates, one may still find something which does not foot the bill. Then what?
Then one tries to change that. Thus, it is not so much the number of themes or formats but the ability to rearrange the parameters.