Welcome Sunnyboy! As people have said, modern errors tend to catch peoples' imaginations and then prices eventually settle down when collectors get a better idea of how many examples really are available.
And of course, unless a coin is unique (and no modern issues are) collectors want the coin in the best possible condition. As soon as it's been spent and been bashed around a bit in circulation it loses some value.
That said, and although I wouldn't actually buy any of these issues, I'd be delighted to find one in my change!
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