Even before the empire, women were collared and sold. It is only natural. So join your place amongst your sisters, and submit to the natural order. It is the only way to be truly free.
"Spare the rod and spoil the slut" is an important tenant for any master to learn. You may wish to care for and protect your property, but that also means keeping her in line. There is nothing safer then an obedient slave.
To those still contemplating their collar, look at just how pretty you can look tied up. Submission is a beautiful thing, embrace true freedom on your knees and in collar.