maybe i'm misunderstanding you, but the question is hypothetical and your response isn't shared anywhere outside the app. (i.e. you're not binding yourself to anything by claiming a particularly high or low valuation)

on another note, your company's valuation is determined by what people are willing to pay :)

I look at it as the reserve price of an auction. Ultimately, a startup is worth what people are willing to pay for it, but under a certain price, I'd rather hold onto the startup and try to grow it than sell it.