It's easy for Liverpool fans to be confused & stunned as to why they haven't strengthened the GK position, but it's not the easiest position to buy for especially with the prices being banded about. It's always hard to judge whether a GK shining in a mid-table team can make the step up as well, so many have done it in the past and failed. Karius was rated very highly in Germany before his move to Liverpool and yet has been a flop, Mignolet looked good for Sunderland and it was predicted he would make the step up to the next level at Liverpool, there's no reason to suggest Butland wouldn't struggle if he made the step up, and he's been poor the past season.
Schmeichel is a solid enough keeper but is he worth spending £20-30m? For me, he isn't much better than Karius and the £ would be better served strengthening other areas. Unless Liverpool find a gem then it's a tough position to be in because there are no guarantee's unless they spend big on Oblak/Alisson. Klopp seems reluctant to really spend big in that position when he knows he could potentially invest it in other areas.