Earlier quoted context omitted.
Part existence probability changes every couple of months, probably not enough time for you to be able to make good estimates. LEGO tends to get hoarded, resold or donated, not thrown away. I believe I have more than 99% of all the LEGO I or my parents ever bought, going back to 1976 or 7.
> LEGO tends to get hoarded, resold or donated, not thrown away. I doubt this. Outside Lego enthusiasts, most people see it as a children's toy which is probably disgustingly covered in saliva and in no fit state for anyone else to touch. It's one of the first things to go into the trash when more space is needed in the attic.
Given how expensive Legos are many people will gladly pick them up from your place, especially if you live in a city. You can look up Buy Nothing and similar groups in your area on FB.