There's a pretty sad reason for this glut: there's the constantly-circulating idea that law school is the French Foreign Legion for the intelligent and aimless; they accept any scoundrel and turn them out a gentleman.
As I see it, the whole spectacle has the bad faith of, say, an 18th-century American slaveholding society happily ridiculing a 17th-century Puritan society – ‘Look, they used to burn their witches!’ – while secretly envying the ease of a time when you could still tie uppity women to the stake. If we’ve managed to become less credulous about advertising, to make it more normal and the bearer of more reasonable expectations, perhaps in 50 years’ time viewers will look back on the silly self-congratulatory subtexts of Mad Men, shake their heads, and be grateful that gender and sexual tolerance have likewise been normalised. Advertising circa 1960 is genuinely interesting. Would that Mad Men had been genuinely interested in it.