I know what you mean by real estate agents.. We'll be paying ours $200+k NZD if they manage to find a wealthy russian to wash money with our existing house
I believe we'll be looking into $2m+ house at minimum but I haven't yet seen any indication that the available real estate information would be any better than for average houses -- apart from bigger pictures taken on a sunny day and "clifftop sanctuary" nicknames (helps googling the property, though). Even with the expensive houses there's a difference between built-to-last and built-to-look-good.
I think I'll rather walk away if I won't be able to check an expensive house as long as I wish. It also sounds like I need to hire Super_BQ for a day to explain all the construction quirks that one should be aware of.