It really hasnt cost me a lot to get to some of those parks.
Bobbejaanland is a couple of hours from Calais, Movie Park Germany is about 4. Get a day break on the ferry for £20, fill a car up with 4 people and it costs peanuts.
We did the Madrid parks October 2012 for Halloween and we got a flight for £60 each, car hire was about £90 and a hotel for £20 each. Nothing really for a weekend away.
Please note this pass doesnt include parking, so like a normal Merlin annual pass.
As mentioned, I have had this pass for a couple of years and visited some great parks which if I am perfectly honest, I have enjoyed than any Merlin visit this last couple of years. So much so that I havent had a Merlin pass for 2 years as well.
Bellewaerde also do a decent pass. For 89 Euros, (£74) you get unlimited access to Bellewaerde and Walibi Belgium, one free Parc Asterix visit, then 50% discount to all other Compagnie Del Alpes attractions, including all the Walibi parks. Not as good, but if you combine the two passes, you have a lot of major parks in Europe free or discounted.