[The Mekon (John Briggs)]

I have noted that there are some IIS members who seen to be regular sellers of astronomical equipment (no names mentioned), yet they are not declared dealers.
I have no objection to their doing so, in fact I have made some great buys off these members in the past.
My question is, do they have some special inside arrangements to access a treasure trove of stuff to sell, (if so I want to know where!) - or do they just frequently turn over their gear?

As one who almost never sells anything I am just curious.