stallzer, I understand your sentiment. Windy is not going to maximize the client's value by looking at a catalogue and then logging in to
ebay.
That being said, this is a nice educational opportunity, and if there is any interest in learning about stamps, this is a good chance. Many part-time dealers won't see some of these stamps very often, and spending time with nicer stamps is a head start on an education.
If it was me, I'd still get a Specialized to learn what I could. But then, I like stamps. If this was a one-time event, and not the start of a process, then passing the client on to an auction house might be fine.
Also, in the interest of setting appropriate expectations, I might say that this appears to be a very nice collection, but I don't know that I'd attach "important" to it. Too early to say that based on what we've seen. And I don't say that to take anything away from what we've seen.