It's a rather strange phenomenon this. One would think a high quality starting keeper should be of prime value as the last man in defense. Would even go as far as to claim that Pinto cost Barcelona the league title in 2013/ 2014 and Casillas almost ended up costing Madrid the Decima. Considering that and the fact that most major clubs have no issues with signing rotational players for upwards of 20 million, it's decidedly bizzare that they don't splurge on a top bracket keeper, especially since the have a longer shelf life compared to outfield players and rarely seek a move. You could spend big on a quality young keeper and sleep peacefully for a decade with the knowledge that one position on the field doesn't need replacing in the medium to long term future. Juventus spent heavily with Buffon, Bayern on Neuer, United on De Gea, Inter on Toldo, Chelsea on Cech and and none of the clubs have regretted the decision as things stand. But then maybe there aren't many world-class keepers worth spending that kind of money on.