I'll play devils advocate here. Depending on the quantity that someone shoots, 60K might be less than a years supply and keeping themselves at 60K is just status quo for them and if they run too low it can disrupt their training or ability to compete.
I'll further argue that production capacity shouldn't be that low right now. While it's harder to get primers, they do come in to stock so one would have to assume winchester, Speer, Fiocchi, Federal, etc have enough primers to produce their own ammo, so why haven't they increased production to try to catch up with demand? If we are truly talking about Tulip market bubble, then eventually they should be able to catch up and then they just ramp down production. If demand has increased indefinitely then if they want to increase profits they need to permanently expand production. It seems that the manufacturers haven't learned from the previous cycles and figured out a cost effective way to be able to match production with demand. Most industries are able to do this, like for example the semi-conductors.