Yes,yes, yes.... IT WORKS!!!
Seems too simple, but it does work.
Try it and let me know what you think.
I picked 2 tomatoes early in the season, they had this blossom end rot.
I did the egg shell and milk routine, no more till I picked one yesterday with some rot again,,,,,
so now I need to retreat with milk I think. I put the milk all over the plant, but the eggs just around the base.
I do the egg shells everyday, but I must have missed one, where I picked it yesterday.