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Lots of things to discuss here, firstly it must be said that there is a great deal of the castle site which is unseen by the public, members or no. It is a much bigger, and far more complicated castle then most people imagine and many are unaware of areas such as Hudsons, Pencesters, the original way in to the underground works, the details of the wall towers, such as Hursts tower for example. Roy Porter is one of the few EH good guys, he knows his stuff and will do a great job on the tour. These tours are built on the tours that were done by the staff at the time the Keep was closed when the exhibition was going in, they were free then!
£25 for members only? Well, you pays your money.......
And by the way, please don't get fooled that EH is concerned with heritage, it's all about the money.