eBay bans sellers from profiting off Coronavirus

> the inflation of prices “above prevailing market value” in order to attempt to profit from the outbreak.

It doesn't sound like those prices are above the prevailing market value, if that's what it costs to buy a mask.

"The best time to panic is before everyone else does" - even if you think 19-NCoV is nonsense, it's still a rational move to stock up on medical supplies - in particular those who are limited in production and sorely needed by hospitals.