I can't speak for Sherry Krauter, but I know a number of highly rated repairers who have practically given up using email because of the sheer volume of messages they've been receiving.
One repairer springs to mind who regularly receives over 100 emails a day, ranging from those asking his opinion on a certain item on a certain internet auction site, to those wanting advice on restoring / repairing a camera themselves, to those wanting to know what to look for when buying a camera, to those wanting to know which cameras would be the best long term investment, to those he needs to translate into english, to those ... well you get the picture!
So with the best will in the world he simply cannot deal with the volume of messages and just doesn't have the time to reply to them all and repair cameras.
John