You basically just said, totally straight-faced: "Don't do it man, it's not worth it! My friend thought he was worth $40 million but was never able to cash more than $10 million out."
That is literally the structure of your comment. You said, don't do it, you mentioned your friend as for why not, and the punchline to his sad story is he only cashed out 25%, or $10 million, of what he thought he had.
By positioning this as your example of a loss, I don't think you could have made a stronger argument for doing it if you had tried. Anyone who has $10M is set for life and independently very wealthy: they're rich. They could fly every two weeks for thirty years, for example (780 trips) staying at a four star hotel every day of that entire time (100 euros * 365 * 30 years still gets to only $1M). I mention these because they're luxuries. He's loaded.