So if the builder sold the home for 1000 BTC three days ago, he is now down 9 million bux. But that is OK, because he still has 1,000 BTC, which will always and forever be worth 1,000 BTC. If BTC converted to USD goes down to $1, he will still have 1,000 BTC! That's a real benefit! BTC, the way of the future!
But the price of BTC is going to $100K very soon. So if you bought that house with bitcoin you will have lost $35 million, compared to had you waited a few months and then bought something similar. And we all the know the price is going to over $1 million per bitcoin in a few years. So you really stand to lose a $1 Billion on the deal if you buy with bitcoin today.
You were talking about the seller, who gets the bitcoins, i am taking about the buyer who hands over his bitcoins. He is going to lose $1 Billion because the price is going to $1million per coin.
That's at least the math that @zenlot and @johnarb live by. They say everyone else who does not subscribe to the mantra exhibits gaps of knowledge.
At todays prices. But he didn't HODL. So will leave $1 Billion on the table if he converts his 1,000 bitcoins into a house.