There are so many answers here about why they use their rig.
Here is one about why we the CG showers, bathrooms etc.
For 20 years before we retired, I used the health club showers 6 days a week.
For the past 17 years we have never used our showers in the rig.
I prefer CG showers, no clean up required, plenty of hot water, and everything is done before wife is up.
One more reason. They are cleaner than your rig shower and bathroom. They are cleaned Every Day. How often do you clean your rig's shower/bathroom? once a week at most I bet. Certainly not every day.
Here are some more questions.
Why do people in the older rigs have a pilot light lit on their stove which gets used only a few times a day? (not meant for the new electronic lighters).
Why do people leave their air conditioner on even when they are gone all day? (not meant for the dog owners).
Why is it that the most essential item when you pull into a new CG, is to set up the antenna?