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5x or 10x is such huge differences that I think we'd already have vastly different lifestyles that putting a number on income wouldn't make a difference.
I see the problem you're getting at but I think multiples in the 1.5x to 3x is more sensitive if you and your friend/colleague is in similar industries or not that close/shallow friends.
If someone ask me what my salary is I usually say that I have no problem at all sharing what my salary is if I can ask them the same and also agree on keeping it to ourselves.