Final answer:
The quote "It's a hard country for anyone, but hardest for Gentiles. Did you ever know or hear of a Gentile prospering in a Mormon community?" explains why the "wretched" aliens could not get a hotel on the strip.
Step-by-step explanation:
The best quote that explains why the "wretched" aliens could not get a hotel on the strip is:
"It's a hard country for any one, but hardest for Gentiles. Did you ever know or hear of a Gentile prospering in a Mormon community?"
This quote suggests that being a Gentile (a non-Mormon) makes it difficult to succeed or thrive in a predominantly Mormon community. This could be due to social, cultural, or religious differences that create barriers to acceptance and opportunities for Gentiles.