Question - What Do You Do With Your Duplicate Coins

Gold
My current want's are early Morgans 78-86,Barber Half's(most),and Franklin Halves(about 8 or 9 still needed).

I normally re-sell most of my duplicates for more funding to buy other coins. After years in the hobby, I notice that we tend to become insatiable in terms of looking for more nice coins, continuing to endless upgrading...thus I go for sacrificing my previous coin thru re-selling duplicates and acquire new types of rarities
You have a superneat/nice working table GoldRush

I resell or trade them. Since you have a lot of newer coins you might not get much and you might have to wait a long time (maybe decades) before you get a handsome return. Instead of keeping them you could sell them now or trade them. Someone mentioned keeping them for their children but I have known people sell their fathers or grandfathers collections for much less than they were worth. Sometimes these benefactors do not want to deal with the whole grading-dealing-auctioning process. Maybe you can sell the ones that have a lower grade in order to buy newer once.

Good Evening,

Eventho I'm new, I feel that keeping a lot of those coins that are duplicates will be in your best interest. Could work out in your favor if you decide to open a business, etc.

I tend to keep all my coins. I tell my wife I will sell them once I get a duplicate. Once I do I tell her ill sell them once I get a full roll for that year. I have maybe 10-15 rolls of 1964 halfs. She has no idea I have that many and I plan to keep it that way. I guess I keep them so I could help out another friend if he was looking for a special coin.

If they are in holders (2X2's, flips etc) I throw them into a box in the corner. If they are loose they sit around on desks, tables etc untill I clean up and then some of them wind up in one of my change containers. I know I have a bottle on the counter right now which has, along with pocket change, large cents, Two Cent, Indian cents, foreigns, seated material etc in it.

I place coins mostly in Albums. Over the years as I acquire a better coin than is in an Album, it goes in and the one that comes out goes into a 2x2 and into those long, two row boxes. If I come accross a new Album of coins I may have duplicates of, I start a Duplicate Album, naturally in a lesser grade than #1. I've been able to talk dealers at coin shows to just give me any Albums they don't want since they bought them for the coins and removed all the coins. Mostly in the past they throw them out. Due to this I have now well over 100 Albums, not exactly sure how many and most all full. I get an Album and fill with coins from the 2x2 duplicate boxes.
As examples of this I'm now on set #12 of Mercury dimes, #10 of Lincoln Cents, etc.
I never sell coins although in the past I've given many to YN's.
The biggest problem with this system is if I acquire a fantastic coin that should go into Album #1, then I must move the one from #1 to #2. Then the one from #2 to #3, #3 to #4 and on and on and on. That is where the fun really ends and my fingers get tired too.