try to stay away from these giant mat borders. many may want to get a mat, and others won't. it will look odd as a canvas. the description is a bit confusing. but ideally, if you want to sell large image, make a large image. don't use empty filler. the smaller sizes don't sell that often anyway.
i don't get why your selling a 8x10 anyway, with the border you can get a 30" print.
do you have a better avatar by any chance?
price wise is ok, your only selling the one size though.
---Mike Savad