I thought UK prices were unsustainable in the early 2000s. Thankfully my other half persuaded me to go along with buying our first house, against my instincts. I remember saying to someone that it was just a place to live, not an investment and there's no way it would ever be worth more than the £200k we were paying. About 15 years later we sold for £350k, although probably half of that rise was the money we spent on the old shack.