but you never know until you try! what you can add on in your emails is that you can trying asking them if they know any other end users that might be interested as well. Plus writing an email doesnt take that much time, just keep it short and sweet. eg:
Hi xxx
I currently own the domain xxxx dot com and was wondering if you or anyone you know might be interested in it. Please contact me at xxxxxx. Thank you
Regards,
xxx
Hope it helps