I guess I don't understand the level of indignation being expressed by some posters here.... although I wouldn't want to pay an "admission fee" to hunt someone's private property, either, I do see where this would be the logical progression of things, and wouldn't be surprised to encounter it. I certainly don't think that the price I paid for my machine & accessories also includes the free access to everyone's private land.
After all, as already mentioned, with the recent publicity of md'ing shows and especially the YouTube videos, and "documentaries" on astounding ancient hoards being discovered.... or caches of gold coins in trees or under rocks... people are going to start to rethink allowing strangers on their property to metal detect scot-free. Whether or not the "fee" is fair will depend on the honesty/greed of the landowner.
Usually, when obtaining a permission, some sort of negotiation is expected, is it not? Why is it so outrageous that someone has started to be upfront about it? Sure, so far many if not most property owners will say "Don't worry about it" but that is naturally going to start changing.... just as soon as word gets around that some md'ers are willing to pay for the privilige, and private property permissions get harder and harder to come by, this will more and more change over to being the accepted norm. The slippery slope in action. We have seen the future.