I use my framboise ludlow fairly regularly. To keep it happy, I keep my keys away from it. On occasion, I put my indigo agenda in my handbag, in the dust cover. Since I don't take it out as often as my wallet, it's ok for me to keep it in the dust cover. An amarante french purse is on it's way to me (hopefully, I like it) and I know I will not keep it in the dust cover. Too much work to remove it from the cover, put it back, etc.
Bottom line: Keep your wallet away from things that might scratch it.