Not sure, it doesn't seem to be seasonal though. It could be a potential case of false inflations since there's a relatively small number of them on the shop wizard so they'd be pretty easy to inflate just by one person. I can't see there being much demand for it though so I wouldn't say it's a legitimate investment item.
On the other hand, any inflation one person does won't be offset by being in a main shop... maybe I'll try it later, I've never tried inflating an item before.