If I search my local CL office/commercial subcategory under housing, I get the option to click the button to "show" duplicates."
But if I search my local CL appliances-by-dealer category, I get the option to click the button to "hide" duplcates.
In my mind, what good is a duplicate ad? Will someone be 5 times as intrigued when seeing 5 of the same ad? I don't think so . . . .
In my opinion, ALL categories should automatically default to needing to click the extra button to "show" duplicates. Let the weirdos who want to see the same thing over and over and over again go to the trouble to make that happen for themselves.