Just on a whim, I went looking for blank playing cards online, and I was delighted to find a whole range of blank board game equipment for sale: blank playing cards, plain white game boards, blank-faced dice with stickers, plain coloured pawns. This makes me very happy just because it's a kind of midpoint between total DIY and professionally-published games.
If you've got an idea for a board game, obviously you can find some cardboard and do a lot of cut-paste-draw-write yourself, but after some play testing, maybe you want your home-made game to look a little more professional. Something you can bring to family and friends game nights. This is just what you need. If I ever hear of a kid who is into board games and is pretty creative (as kids often are) then I will order a bunch of this stuff for their birthday or Christmas, probably along with some professionally-published game too.
Mokalus of Borg
PS - I don't think the world has enough good board games.
PPS - I also don't think there is enough good board game software, but that's another story.