Interesting subject! I recenty was invited into a neighbor's house to look at something, and he took off his shoes when he entered the house in front of me from the garage. I hesitated, then asked if he wanted me to remove my shoes. He said it wasn't necessary, so I didn't. I have very soar feet and need any cushioning from my shoes that I can get, but don't usually share this. I always feel uncomfortable in this situation. I generally make a more concerted effort when wiping my feet before entering someone else's home.
Some people may just like to walk barefoot inside, and may not do so to attempt to keep the carpet cleaner.
One last thought. I have heard that the oils in your skin can be more harmful to the carpet than the dirt on the bottom of your shoes.
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