Characters
I'll admit I may have seen better days...but I'm still not to be had for the price of a cocktail, like a salted peanut.
— Margo Channing ‧ All About Eve

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Margo admits she's seen better days, then refuses to be cheap. A cocktail won't buy her, and she's certainly no salted peanut. The snack comparison makes her pride sting more, since peanuts are what you grab without thinking.
Context reviewed