Why would a company do something in the interest 
  of the consumer if it was not in their interest

There are many reasons, but if for no other: so that emails like this don't leak and cause you bad PR! There's a whole school of thought around being 'customer focused' that boils down to the Golden Rule (but in MBA-speak). I don't know how many 'customer focused' businesses really walk the walk; probably not that many in situations where doing so requires real guts.