I answered this question the last time this was discussed.
The system isn't much different from that that is seen in the UK.
The difference is that in the UK people will buy/sell: 6, 8, 10 or 12 houses in their life, in Europe people will buy one. So if in both cases there is a 1% of chance the sale falling through for whatever reason it will at some point in their life happen on average to 10% of brits but only 1% of other Europeans, so a minor problem in Europe becomes a major problem in England.
HTH
TIm