if you think the house price is right for what your getting then yes it is.
Sorry but you cannot equate the lost value of a new car to the lost value in a house...a new £15'000 car that has lost £3'000 when it's driven of the forecourt hardly rates against someone paying 250'000€ for a Spanish house then two years later it has dropped to about 80'000€ ...exaggerated price drop that it might be.
Some folk have lost everything, and more, and on many occasions it wasn't through bad judgement or paying to much for the house........Hardly what you would call "Cant tolerate losing any value at all".
Correct you cannot time any markets, house's, stocks, cars etc, but you hardly go into real estate knowingly and fully expecting to lose, remember in some cases all the money, thankfully i haven't done it this way, whereby you do know for sure you will lose money on many other purchases, new cars being the top one, the stock market agreed up and down with for the most up, but then on balance it's almost a 50/50 bet.
You have now come back with a new set of statistics regarding what you first spoke of, and if this pending house purchase is not to be considered an investment of sorts then i don't really know what is.
As for not selling no matter what it was worth, i thought like that with my last house in Spain, then when i found out what it was worth....... I sold it.