I'm not quite sure on logistics, but I would like to send several stickers to one address. Maybe it could be a feature called "sticker packs" where someone could specify a maximum amount of stickers the recipient can request.
I wouldn't want it enabled by default, either I would want it to be a separate URL or enabled via something like a product code.
The main use case would be for sending people stickers to hand out to others. Like a pack of 5 or 10 stickers before a conference. Or just ordering several stickers for me to have on hand.