Reissues: For those of us who ride the old bikes because we feel they are superior, a reissue would allow us to use them daily, in the rain, without worrying about wearing out an irreplaceable piece.
Furthermore, bike fit is important, and often it is impossible to find an original that will fit. And especially with French bikes, there are so many features and combinations thereof, that it is unlikely you'll find the one you'd love.
So it makes sense for people to order a 1970s Alex Singer, even if they may already own an original.
If I could go back to 1953, I'd order a few René Herse bikes for my personal use...
Jan Heine, Seattle