There's certainly some powders out there I'd be happy to pay that kind of money for, if I could get them at all.
Who are you to tell them what they should sell their property for? And what bearing do their prices have on what they're willing to sell to you for? They can sell them at a loss or at any price they want to ask for them.
I think shortages are a GREAT time for people to learn about how markets work and what prices signify.