why wear a collar

Why do you wear a collar? Why bother with it at all? In
Gor, there are seven common purposes to a collar
1) Visibly designates a girl as slave
2) Impresses a girl's slavery upon her, makes her
more aware of her slavery
3) Identifies her Master
4) Makes it easier to leash her
5) Makes it easier to put her in various
ties/restraints
6) Because it is beautiful
7) Because it pleases the Master to do so

number 7 is the most important