I don't think that the actual amount was mentioned until the last run of episodes. Prior to that I only remember it being a huge pile of cash that they had "stopped counting."
I don't think that an amount of money constitutes a spoiler, unless that very specific amount has something to do with a specific plot point. ("Ouch, my cancer! If only I had $80,000,001 exactly!")
I always err on the side of "it's a spoiler". If it's not in the show's trailer, I treat it like a spoiler.
I know that I'm personally much more sensitive to spoilers than a lot of other people, so it always annoys me how somebody says something thinking they're not spoiling anything without fully thinking through the implications of what it is they're saying. It's almost arrogance, really, to simply assume that you know what will and will not spoil some given experience for another person.
