I don't have any inside info, but I'd guess that the "people who use plug-ins to cover endemically bad smells in their living space" and the "people for whom a

I don't have any inside info, but I'd guess that the "people who use plug-ins to cover endemically bad smells in their living space" and the "people for whom a $200 air purifier is a viable solution" markets don't have a ton of overlap.