I personally don't value the card any higher but some people would. much like cards 99/99. I consider jersey numbered cards a little more valuable because I know others value them more.
Generally for me though, it's just a number. I see "first card made"..well technically it's not necessarily the first card made it's the first card through the little press.
If you think about it, if the numbering is on the back then it's more than likely that the last card in the stack (likely the last made) is actually the first to be numbered in the press.