Which dropped catch has proved to be the costliest catch drop in Cricket?

Answer 1

I think these 3 dropped catch has proved to be the costliest catch drop in Cricket.
Edgbaston 2011 - Ishant Sharma drops Alastair Cook - Cook scores 294

Sydney 2012 - Ishant Sharma drops Michael Clarke - Clarke scores 329*

Wellington 2014 - Ishant Sharma drops Brendon McCullum - He scores 302

And these are the highest three scores made by a batsman against India in the 21st century.