It works the other way, too. Water is a commodity -- a commodity which is, essentially, free at the margin -- that is also a multi-billion dollar business in the US. Much the same could be said about food.
(I am about to step on some toes. Turn away if you're easily offended.) There are entire industries which are designed around the proposition "You are too good to consume X. Poor people consume X. You should instead be consuming X Prime. You can tell it is better than X, because it costs five times as much."
A separate but related issue: consumption of status goods among poor people.
In terms of selling B2B services, I am often amused by re-luxurization of commoditized services: taking something which was once customized and extraordinarily expensive but then made into cheap-and-infinite-scale and then competing with the cheap-and-infinite with something that is a cut above but which still scales.
Data centers circa 1996: luxury service. Web hosting: commodity service. Slicehost: not a commodity service, but the marginal cost to the firm is still close to zero.
Personalized financial advice: luxury service. Your bank's website and free checking: commodity service. Mint: personalized financial advice, but at scale.
Graphic design: luxury service. Stock icons: commodity service. 99designs: commodity-priced luxury service that scales.