It sounds like a good name for a website that you could develop and use to sell the rest of your domains (if you have more domains to sell).
You could forward all of your domains to that site called "imperialdomains.com" and that would be your primary method of advertising the domains that you have to sell.
As far as trying to sell "ImperialDomains.com" to someone else, I just don't see it happening. There are already many websites that either sell domain registrations, forwarding, and other services related to domains. There are also already many websites selling domains in the "aftermarket."
In summary, it seems that the name Imperialdomains.com would be good for development and it would be good for you to use as the homepage to sell the rest of your domains.
But I don't see a big market for just selling the name Imperialdomains.com to another speculator or to an end user.