I agree with everyone about sending a reply. They opened the door as "might be interested", so why not send them your reasons why it is valuable (along with a BIN).
Also, check Namebio, DNJournal (or your favorite tools) for reported sales of domain names that are similar or have the same key words (include the list of reported sales if they help your case.
And don't forget to check Estibot and GoDaddy's Domain valuations. If either (or both) valuations help your case, include a link to the tool(s) so they can see for themselves. Of course if the valuations are too low, then don't bother to include them in your reply...
Regards,
DN