Of course I would let mine go for a million. But I only have a small collection so it'd work out at about $14k per figure. Bit of a no brainer, even taking into account sentimentality. and I'd probably buy them all back anyways.
How about if you were showing your collection to a rich person and they began offering (say) more than triple market value for particular individual figures? How many do you think you'd let go?
I think there are quite a few I would probably give up.
Maybe use the money to buy some others I wanted more...
TF Figs of 2024:
1) Legacy Magmatron
2) Legacy Gears
3) SS102 RotB Optimus