On buying end of acquiring coins from families and estate sales: I've had families get upset when they don't get offered the amount they see in a Redbook they got from the library or Ebay listings. 1.) People need to understand that you're going to pay a 10% seller fee on Ebay when you do sell and also a Paypal fees. Not to mention any shipping/packing fees 2) Also, what the market is willing to pay for a coin, vs the retail book value. Those are two different worlds. I'm offering cash money and a decent amount for what they have, and they too often pass. Oh well, take your luck at a coin shop or Ebay.
That sounds like a good reason to liquidate one's collection instead of passing it down to heirs who are not interested in numismatics. I will most likely downsize at some point in time and if I do keep part of the collection I will leave detailed instructions to my heirs as to the best way to sell it (and what not to expect getting for it).
Something every collector learns, unfortunately usually after they have sunk a lot of money into buying them. And that is why the dealer pays so much less, because he is going to have to do all that work to get a return on his time and investment. He is going to have a lot of time, effort, cost of packing and shipping, plus ebay and paypal fees. His money is going to be tied up for who knows how long, plus he would like to make a profit after all that. (Oh and then there is dealing with returns, no paying bidders, relistings, and some outright fraud) It is no wonder a dealers offer may seem low.