Design templates, industry related question

I have a small question which could probably turn into a small discussion here.

Obviously there might be quite a few sites on the net, of which Template Monster is the most popular, which provide design template packages for a certain fee. A while ago I was hinted, by a designer acquaintance that there is an open market for unique templates. Meaning design packages which are sold not as a copy but as a single product - similar to a customer ordering design done.

I am not a designer or a specialist in the design industry in particular so I cannot asses the full market potential. I did a small search on the web and found several providers of unique design templates. My question is however concerning the relative profitability of such a venture. Existing numbers do not unfortunately reflect the current market structure, therefore I would like to hear some opinions from people who are closer related to the industry. Is there substantial demand for such products provided for example I can offer prices substantially below existing market ones?