When you talking about template I'm asume you mean website design that original design rights not belong to you , and it sold multiple times. Is it only PSD file or something else comes with it?
Head on over to the Sitepoint Marketplace for Templates and have a look around at what similar templates like your are selling for, that should give you a rough idea.
I don't know, but it looks nice. There can't be much money in creating templates. Why not hold on to it for when that $50k ecommerce project comes along?
I would say $1500 for custom unique design and maybe $100(max) for multi-licensed. This is based on couple designers I know they charge $1500 for the custom psd template for the home page. But no offense they do higher quality designs then yours. If it would me I probably would charge for something like that $700 max but I think I can do it even faster.