I agree with Paul. In the past when Spanish properties were cheap as chips say an agent charging 5%+ was acceptable as he/she had to pay their bills and feed the family etc. It was also hard work as mortgages were not so readily availible.
In, todays time the properties are costing as much as other major cities of Europe this charges cannot be justified.
In, UK where the commission is 1.50 % the estate agents make a good living with very similar overheads.