Selling Model Railways

[Newportnobby]

Rest easy. I haven't popped me clogs yet
A recent post has led me to ask "Has anyone real experience of selling either their own or maybe a relation's model railway collection en masse i.e. the entire collection.
I'm not talking about the forum N'Poriums or EBay for just a few items. I'm talking about maybe the box shifters who advertise "Best prices paid for your collection" (yeah, right) and then being stunned at just how little our valued collection is worth, bearing in mind, of course, they would want a profit when they sell it on.
I think any such information could be useful as a very rough guide (everyone's collection is different), and what would be offered this week may be different next week so I emphasise the 'rough' in the rough guide.
Any recommendations or 'avoids'?

For example - I won't be around to sell my stuff and anyone who does sell it would have no knowledge whatsoever on the subject