I think that others have experienced this, and it was discussed some time ago. Many have suggested that they may get swamped with replies, and can't write to everyone or they may not be able to afford the stamps, envelopes, or whatever, when someone does write. The other possibility is that they may simply not feel compatible with the writer. When we go through the ads, trying to decide who we might like to write to, how many do we by-pass? I'm sure that they go through the same process of elimination that we do.
Just my 2¢
Live simply, love generously, care deeply, speak kindly.
Cowards are cruel, but the brave love mercy.
"The purpose of life is to contribute, in some way, to making things better" Robert F. Kennedy