Americans, as a group, are not especially intelligent and can be readily entertained or fooled to produce financial benefit for someone.

Americans, as a group, do not have good taste or sophistication and can be easily amused or distracted to produce financial benefit for someone.

Do not criticize others if you have similar weaknesses yourself.

Alternative form of people who live in glass houses shouldn't throw stones

Alternative form of nobody ever went broke underestimating the taste of the American people

Alternative form of nobody ever went broke underestimating the taste of the American people

Lack of people.

A village and civil parish in Wychavon district, Worcestershire, England (OS grid ref SO9350).

(Internet slang, uncommon) Crowded or bustling with many people.

(rare) Having no people; uninhabited