I've noticed rich people in poor countries are very aware of what is not becoming of them. They were probably waiting for some poor person to come work for a few dollars a day to come do the jobs beneath them.

I've seen it with the wife's family (middle class South American). They are used to my strange ways now, but they were shocked when they saw me washing the car, doing the gardening, tidying the yard, "why are you doing that, you have money, just pay someone".

It may be the fact that, even if you tidy up your yard, as soon as you step out of the premise, you're in garbage land - if you value beauty, you will be depressed anyway. Plus, no doubt it's partially cultural i.e. a lot of these well-off people grew up poor, so it's in their values to not care about the beauty too much (they were raised by their poor parents to focus on survival, and that's what they did for their whole life until they became well off). Their children may be different though, esp. if they go to an university in a cleaner city.

Cultural inertia.

People don't just suddenly change their habits because they have more money. I'm in Taiwan and see rich people live with what seems like poor people habits all the time. Everyone is simply used to it and sees it as normal.

I think attitude changes are more likely a result of education and the opinions and behavior of your peers. Limited contact with other cultures and ideas keeps habits and concepts of normalcy where they are.