I doubt that anyone would go to Spain with the objective to buy 8 off plans and clean up in the process, no doubt the concept was sold to them. I am sure the questions would have been:
Will I have any problems selling before completion.
How much will they be worth by completion.
Were they advised that legally a transaction has taken place and they could be liable for 35% capital gains tax on each potential sale.
I would concede however that if good advice was given and these and other questions were answered honestly and the couple still decided to make such a purchse, then they were indeed both incompetent and greedy.
Guess we will just be left wondering what really happened! 😉