That's a huge amount for a goalkeeper that isn't recognized as one of the top 3 or 4 in the world.
The top 5 most-expensive players in the world have all gone for over EU100M, and only one of them wasn't within the last 12 months (Pogba, one season earlier, which is what prompted Klopp's comment that Steve is bitter about above). It's almost like prices have gone up...?
Courtois goes cheaper, but only has a year left on his contract and he loves him some Spain. DDG would go for more, but did spill one in the WC. Lloris did too, but I think you're already in debatable territory on 'best keepers' with Lloris, and both him and Neuer are 32. I'd assume Ederson is right up there in the top handful, but then Alisson surprisingly keeps him out of goal with Brazil. Alisson is only one year older and broke into the squad when 23. Young keepers breaking through at that age and getting people excited are who? Oblak had his buy out clause doubled from the already high EU100M. Ederson went for a world record fee. Kepa at Bilbao ended up staying put (he's a short keeper too, in the Pickford/Navas range).
I've made this point before, but maybe it was only in the LFC thread. You don't get subbed as keeper. So if you are good, and want to play, you move to a club that will play you 95% of the time. Clubs with big money have been flirting with this idea of having two good keepers, but it rarely lasts long because most keepers want to be out there on game day. So it's not that hard to get a solid keeper and that has traditionally kept prices down in that position.
What has changed is the idea of the ball-playing keeper. As much as people talked about Barca's tiki-taka, it's the press that was their main weapon. They wanted the ball back as soon as they lost it. With a lot of teams pressing now, people have decided a ball-playing keeper is one way of avoiding that pressure and having more control of the game. They are much rarer and so prices are going up. As they of course have gone up for the great keepers. There also appears to be a dearth of really good prospects coming through. Alisson doesn't seem that amazing to me (we put 7 past him in the UCL legs), but highlights suggest he does have really strong hands and can come out well.