To make the claim that it is ..."a clandestine drop in alcohol content" is BOGUS!!!! Read the label! Oh, you don't read the labels? It that their fault or yours?
But, I honestly doubt that consumers prefer the "lower alcohol content" ... they probably prefer the lower cost of the "Green" label - and that's hard to find around here because nobody buys it - they all want the "Black" label.
I'll let Raninee explain why 80-Proof is cheaper to produce than 90-Proof .... and thus cheaper for the consumer.