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im heard someone selling his house to invest at bitcoin in middle 2010
i think now he can get 3-4 house

I am sure he or other early adopters of bitcoin now have more than a house probably they have some palaces!
yes, it is just one great example.
However, if we do that right now I can not guarantee that the result will be like that.

how lucky

he just take risk and try his luck. maybe he is crazy that time but now he can say he is a genius he invest in btc in the right time with high amount and he got a high profit.
if i was him i will not do it in that time is really scary to risk a house it is a high type of gambling but he belivre in bitcoin and that is why he got lucky.
With the current flow of bitcoin in the market doing that right now will be a real big risk,he is just so luck that the price then was low and then skyrocket in few years but that wont happen again.