Just how much does a plug decrease a coins value?

Assuming that the plug/repair was done properly. I'm watching a coin that lists for $400.00 in fine condition however the coin has been repaired. It's a decent repair job although it can easily be detected once you know where to look.
Edited to add- normally I would not purchase a plugged coin but this one is considered scarce and you dont come across them often.
Edited to add- normally I would not purchase a plugged coin but this one is considered scarce and you dont come across them often.
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Comments
Chances are that if it's a rarer coin (by date or variety), and one that's rarely seen, a plugged example will sell for closer to the "undamaged" price than a commonly seen, err....widget. But still at a considerable discount in most cases.
<< <i>It depends. A plug on a common date seated quarter makes it virtually worthless. A plugged 1794 silver dollar is still unaffordable to most. >>
Totally!
JT
I collect all 20th century series except gold including those series that ended there.
If you have a hole in a coin, a plug does not help.
TD
WS
Problem coins are easier to buy than to try and sell. A lot of collectors don't want these coins, so it takes a lot more time to find a buyer. Dealer offers will reflect this reality.
The name is LEE!
I do not plan to buy a plugged coin in my future.
"La Vostra Nonna Ha Faccia Del Fungo"
Did anyone see the rare 1783-dated colonial in a recent auction which was boldly plugged but in a 3rd party holder simply reading "damaged" and with no plug noted in the description? Oops.
Betts medals, colonial coins, US Mint medals, foreign coins found in early America, and other numismatic Americana
v= Net value
a = Value no plug
b = constant that adjusts for rarity
s = size of plug
<< <i>v ~ ab/s
v= Net value
a = Value no plug
b = constant that adjusts for rarity
s = size of plug >>
Another formula is C²+4h²/8h=R
Of course it doesn't have anything to do with the value of a plugged nickel.
Ray
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K S