I think that it's a possibility. One suggestion... if you are going to market small businesses in general, make sure that the templates are grouped around niche businesses.

i.e. Catering business templates, florist templates, photographer's templates.

You might be able to go to a local small business in a niche market and ask them what you could do for them for free... any help that they want / need? With the understanding that what you develop free for them will be on your site either free or for sale. That way you can get information about a market without already being the expert in it.

Marlin Creek - Idea Seeds
http://marlincreek.com