Namebio has one reported sale
i--a.com $1,000 2011-07-02 sedo.com
Does not mean any comparable domain will ever sell, or that this sale is the benchmark...
Frankly, I think this one would be tough to sell. Domains with hyphens can sell, but double hyphens kills any prospect of a sale. I'm not hopeful about this one.
An L-L.com could sell for low $$$$ though.