That is funny. Maybe it has something to do with the humidity in our area? I live in a very dry area. I know some people have great results with Leather Therapy. I've never liked anything it has done for me. I can't understand why it is so different for me.
I think your theory about the humidity is a good one. I live where it is hot and humid in the summer and drier and cooler in the winter. I think bags rehab differently in the summer compared to the winter. In the summer, it seems like it takes bags forever to completely dry out after a bath, and the conditioner absorbs much more slowly than it does in the winter. In the winter, I usually have to do at least one or more extra rounds of conditioning. I can see why Leather Therapy may not be as good of a product in a dry climate.