..owners don't know what to do with domains..
... but thats just knowledge acquired over time.
Any time you do outreach; you are leaving money on the table in favor of the buyer.
I'm curious how you gain that knowledge while you wait for inbound? Let me guess...read, read, read. Because it's obviously not an action taken by people who wait for inbound--by definition, they are just waiting for the inbound.
As for leaving money on the table, time is money, is it not? So how is that time waiting for the inbound $X,XXX valued?
It's interesting that domaining seems to be the only business where inaction is favored, at least if I am to judge by the comments here that advocate the rocking-chair method, that is, wait for inbounds.
In no other business does anyone advocate that you learn to buy inventory and wait. There is obviously a difference between an investment and a business. If a business then you have to do something, and you also learn by doing, even if that means spending some money initially to buy worthless crap (like I've done). Usually you learn where the investments are to be found. Example from another industry: real estate, where as an agent you learn to sell and also learn to invest.
I was "spammed" recently by a domainer with a free email account who offered me a type-in domain associated with my business. I paid what they asked (which was under $200)...didn't even haggle because I know what it's worth to me but they didn't. Those that speak of spamming miss the link between sending an email that has a connection to the end-user and offers an opportunity.
As for owners not knowing what to do with domains, I would think that I would stop buying stuff I don't know what to do with--in my book, it's called hoarding for no good reason (!)--they could just let them expire or sell them cheaply here. Or maybe it' more of they'd rather wait or let someone else do the sale.
