while I agree with most of your last paragraph in your post, I think you are being overly kind?. The property markets in Spain are in such a mess mainly due to to massive corruption right through the industry, leading to regulation being a joke. On top of this, the whole justice system did little to stop the crooks, because once again the crooks were and are represented at the highest levels!!
Your last sentence???, well I think percentage or not, a huge number of properties in Spain are not legally built in one area alone, as rob pointed out in his last few posts. X that amount through all the costas and the amount is huge! The misery this has caused should never be under estimated or in any way be considered small, and any comparison to misery caused in the UK through the corruption or greed here recently in the news is just stupid as I realise you know.