As someone who lived in the Coachella Valley for 6 years here's my take.
Rancho Mirage is one of the nicer and wealthier cities (next to Indian Wells) in the valley. These homes will be picked up by rich Snowbirds* in like 5 minutes and will only be used in the winter months when the weather is nice. This community will sit abandoned during the summer months.
View attachment 621574
*Snowbird is the term the year-round locals use for the retired grey-haired people that only live in the valley during the winter months. The population almost doubles in the winter and goes back to being light in the summer.