Quote:I do not desire just one particular coin, so I would get bullion just so I could sell/trade it for all of the coins that I need to fill my remaining Dansco holes.


(minus the Dansco part, don't do those yet).
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I would much prefer the single rare coin, although I would want it to be from my present want list, rather than some audacious monster coin that I could never afford. I always keep about 50-60 coins on my want list. Each one helps me get closer to a goal I have set.
I understand, and mostly agree with, your idea (though I don't have
that well-developed want lists).
In my particular case, the most likely candidate for "that one coin I kind of want but really cannot afford" is probably the 1724 copper kopek, which I theoretically need for my kopek type set (I used to dismiss it as a pattern, but apparently it isn't). Apparently a low-grade example sold for $600 a few months ago...
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I couldn't imagine owning a single $10M coin; that kind of money would be used to finish my Roman collection, and top it all off with a Brutus Ides of March denarius, and a set of classic Greek tetradrachms.
I don't have anywhere near as much of a Roman coin collection as you do, but otherwise I essentially agree with you (though I would have probably tried to go for a reasonably full emperor set, maybe with a segue into Byzantines, rather than just that one Eid Mar).
This would require following jbuck's suggestion, however.
And unrelatedly - my first thought was "$10M in silver bullion might not fit in my apartment!"
Apparently, it would actually fit - even accounting for packing, it's only 3 cubic meters or so, i.e. it would take up less space than my double-decker bed - but it would definitely break the floor.
($10M in gold bullion, at modern prices, would not even break the floor - it's only around 200 kg. Which is far less than I expected, by the way.)