What does 衣欲新, 人欲舊 mean?

Last night I came across the following Chinese expression that I thought was quite clever.

衣欲新, 人欲舊
의욕신, 인욕구  

"[For] clothes (衣), [one] wants (欲) new (新); [for] people (人) [one] wants (欲) friends (舊)."

舊 (구) can mean both "old" or "friend," as in 친구 (親舊), so the writer used 舊 to make a pun since the sentence could also be translated as follows:

"[For] clothes (衣), [one] wants (欲) new (新); [for] people (人) [one] wants (欲) old (舊)."

Here is another clever Chinese expression.

朋友有舊 

붕우유구

A friend (朋友) is (有) a friend (舊).

Friends (朋友) are (有) old (舊).

Friends (朋友) have (有) friends (舊).

朋友 [means] 有舊.

Concerning the last one, 朋友 (붕우) means 친구 (親舊), which means "friend," but one of the meanings of 有 (유) is  친 (親), so 有舊 (유구) and 親舊 (친구) essentially mean the same thing.