For me, a workable "twist" to a theoretical collecting concept.
The "Box of 20" is a quality approach to collecting which is achieved and reinforced by limiting the collection size to 20 coins (or any limiting number that the collector chooses). Any additional coins may be added to the collection only by elimination of a previous "place-holder".
I've observed a number of "chat room debates" re. the pros and cons of the concept, but never gave it much serious thought- that is, until my recent "sculpting" efforts on my collection reached about 99.9% completion. This led to an interesting discovery.
As I reached the final 30 or so coins to be dispersed, I found that I really didn't want to sell them. Through the decision process, I stumbled into putting the most "appreciated" of the dispersal candidates (I can't bring myself to call them unwanted coins.) into an NGC box of 20. After a while it became a conscious process. Now, each coin for sale goes through the box of 20 selection process- The "least desirable of the desirable don't want anymore coins" is kicked out of the box and sold.
I now have 20 coins for sale, and I don't care if they NEVER sell!
Hmm, I may have just uncovered another difference between a dealer and a collector. A dealer can't afford the luxury of owning a sales inventory with "no priority" to sell.