A better question is how many teams playoff runs have been ruined by poor goaltending? Price, Vasilevsky, Bob, Oettinger. Look at the goalies in the finals the past 4 years, most are top tenders, even if they weren't high paid. Price / Vasi was the final a few years back, two highest paid goalies in the league.
As goalies get a larger share of the cap going forward, this myth that you don't need to spend on a goalie will die a deserved death,
And yes, you can win with a mid tier goalie if you have an incredible team and that goalie gets hot, But that isn't a winning strategy.