A coin like this would look really nice on your key chain.
As for the economics of the trade, so what, and that is coming from someone who is always analyzing things that way.
Two circulated common
Mercury dimes, certainly no more than $3 total. Probably stretching it a hair honestly.
Say the cull Large Cent is a bargain bin $1 coin.
You are out $2 bucks max at this point in time.
That is now, going forward I doubt the cull copper goes up much more than the Federal Deserve Note it is currently worth. The greenback will lose at least 2% compounded annually as well.
Silver may go up, it may go down.
At an all time high, silver is roughly triple what it is now so maybe those are $4 dimes each. Your loss would be $7 then, big deal.
Say silver goes down to an all time low for your lifetime, perhaps $5 or so. Then those dimes are only worth maybe $0.45 each and you are still down but only 10 cents.
So for the history of time as you have experienced it, this trade doesn't work financially.
You gave essentially $3 in value and that is a bad price point for cull large cents (later ones anyway). You won't get anything without a hole, bent, scratched, etc at that price point. A fair trade would have been one silver dime at most, even a bent one. For about 3 - 5 dimes you can get a Large Cent without a hole, without being bent, and without X marking the spot. Still a rough looking Large Cent, but problem free for the most part.
Like mentioned earlier though, there is value beyond financial. For me, this goes on my key chain and becomes a prop for conversation as needed.