It's not like we've never done stickers before:
http://www.seccs.org/forums/showthread.php?t=403
http://www.seccs.org/forums/showthread.php?t=432
So, we do know what it takes to get them made and sold. But we haven't had a huge demand for them and no one wants to pay the printing cost out of hand then have to try to sell them for the next two years to get their money back. The alternative is to take pre-orders and manage the money and inventory before ordering them. Which we've done in the past, but that takes a lot of effort... more effort than has seemed worthwhile considering that there hasn't been a big demand for the decals.
I'm not opposed getting some stickers made to have on hand, and it would only take me a few minutes to check that the design in Illustrator I've got is good to go. But I don't know about floating the cost of getting a batch made, and I'd rather not go the long tedious route of pre-orders.