Working for $1 per year

In the US, it’s more than mere symbolism. Not every promise is a legally-enforceable contract. If you tell me that you will give me $100 as a birthday gift, and you don’t do so, I cannot sue you for breach of contract.

(for any lawyers playing at home: I’m aware of the detrimental reliance cases, but let’s not complicate things.)

Same disclaimer.

Not badly reasoned, but you missed at the end.

In many (if not most) states, continued employment is deemed to be sufficient consideration for such agreements by an employee. If the timeline is something like: 1995-hired 1997-signs NDA 2000-fired, it’ll have continuing, post-2000 effect (assuming it’s otherwise valid).

At least in my state (Illinois), and I don’t think we’re in the minority on this one.

Same disclaimer. Even in Illinois, other factors might make the agreement invalid, so don’t rely on this without further analysis of your situation.