I think that this is a good idea, I've seen people in the internet marketing space sell themes and templates like this. What you should do is customize the temp

I think that this is a good idea, I've seen people in the internet marketing space sell themes and templates like this. What you should do is customize the template for different niches, i.e. one for lawyers, one for doctors, one for dentists, one for chiropractors, one for restaurants...