10BTC is pretty enough and I can buy a good house with that amount, I don't need to buy a huge house like mansion because I believe bigger house entails bigger expenses, you cannot treat it as investment unless you receive an income using you house.
How can you buy a house with 10 BTC.? Maybe if we moon over $10,000.
I still believe that you can buy a house with 10 BTC, that is possible in poor countries and for me with that amount you can buy a little house yet a very durable one that you can already secure your family.