This is wrong in this case as there is no financial cost of funds as I have already pointed out. You have failed repeatedly to back up your claim that the op is losing €1000 per week by having this property.
demoivre, I'm a little lost. Why do you say the OP is not losing 1000 per week? If they sold the house and put it in the bank @ 5% they'd be making say 1000 per week. Letting it sit they earn nothing. Opportunity cost. Am I missing something?
It's just academic to say they are not 'actually' losing 1000 per week.