What is with MGB jacks?

[ksmith40@centurytel.net]

They made how many thousand MGBs over the years?
And of those thousands, how many are still being used?
And the jacks didn't change much over those years?

So why is that everyone wants a mint for a jack?

It seems to me that there should be a surplus of jacks lying around based 
solely on the number of cars sold vs. the number of cars being driven.  I guess 
I need some enlightenment on this.