They are spawning, but there is 1 or more people who just keep taking them all, usually to leave them standing near their spawn point for days. It's the new noob troll thing, I got lucky and found 1 that hadn't been picked and it was a thrower so I left it for someone who might need it. Well he was gone in an hour so I can only hope someone who needed him got it, but I doubt it, since I see similar named people always logged out at the spawn locations.