AP007, we played one weekend with a member at La Cañada, who told us that his membership was about €1200.00 pa. I can't quite remember the details of that membership though, but think it was unlimited golf. The last time I checked at Duquesa Golf, their membership was about €1200.00pa unlimited golf. A little while ago, we were told by the manager at Doña Julia that they were thinking (at that time) to introduce membership at €1400.00 for unlimited golf and buggy use.
Although I'm sure there are many clubs which are far more expensive for membership, I do think it is worthwhile taking membership if you wish to play regularly (I'm planning to) - even once a week at €50 would cost double the membership of one of those clubs.
Just as an aside, I recall about eight years ago enquiring of Loch Lomond club about their non-resident membership - thinking that as we may visit the family more in Scotland, it might be worthwhile considering - only to receive an email from them informing me that it was £100,000 Not comparing folks, it just came to my mind and thought I'd share it!!