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Don't know what tonal/wavelength/hertz the typical humming is, but some sounds are universally pleasing.
A parallel is the shopper olfactory experience of first walking into a store, and smelling stink vs. inviting florescence.
Except for those immediately allergic, it makes the time spent more attractive.
Customers attract customers.
Corporations are quite versed in subliminal intonations:
-You hear it in the music, and the immediate visual images past the doorway.
-Old experiments tried included sub/hyper-sonic shopping suggestions outside the human hearing spectrum, and pumped over the sound system.
-Anything which controls the cattle.
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