Snake lighting requirements aren't well understood, but it's generally accepted that they do fine in captivity without UVB light, especially the nocturnal species. I have never heard of a reptile having respiratory problems specifically because of lack of UVB light...skeletal problems for sure, but not respiratory. Lack of heat can lead to respiratory infections, and improper lighting can inhibit basking behavior in some species, but UVB wavelengths aren't directly related to respiratory health.
Regarding the argument that people don't buy lights because they're expensive....I wonder how much she thinks some designer morph ball pythons go for?
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