[TheChaplain]

Well, you may not like it, but BK probably have done their research and found that employees positive interaction with customers equals more sales.

Yes, there are probably a thousand other actions they could take to increase number of sold meals, but my guess this one is easy pickings, i.e. cost vs return.

[SirFatty]

Around where I live (Chicago suburbs), BK restaurants are closing often. Even new ones, open for a year or so close down (many buildings are turned into dispensaries for some reason). Their issues are deeper than how employees greet customers.