You must have one of the largest collections around?
Not by a long stroke
See Floortrader and others here for that.
I have Strong collections in Turkey and Romania,
that's about it.
The rest of the collection is common material gifted, or purchased on a budget.
I have around 300 Stamp Albums, but if you consider say Austria
(3 albums) when one collects postmarks, ephemera, etc
The Volume increases but not the value.
Never worried about value.
I like to collect what others throw away.
I get pleasure from getting stamps of Sharjah, as I do Turkey
Stamp collecting to me is just fun.
I scan every stamp that passes my desk, so 1 million scans
and a growing Library is a real pleasure
....and "XYPlorer" my favourite File Explorer, and Postmaster's "Stampfix" make life so enjoyable.