It's the same as (or at least related to) a restaurant's policy of always stocking an $800 bottle of wine. There's bound to be someone who comes along and wants "The most expensive bottle/ric in your cellar, sir!"
99 days out of 100 will go by and regular people will just be ordering the $40-$80 bottles, but you want to be ready when that jackass walks in with the company credit card and/or someone on his arm he's trying to impress.
Sooo your saying if I have an office tank I can use my corporate card to buy corals??