Appraisal tools really have to get away from the idea that there is anything "wrong" with long domains. There isn't. The most valuable lesson any domainer ever taught me was that length isn't relevant (still talking about domains here btw). Even the longest domains can get type-in traffic etc.
Sure, for "branding", length is an issue, but for regular domains, they can be as long as you like, well 63 chars, and still have lots of value.