Its interesting to see all the different perceptions of the meaning and/or need of a collar. What that does of course, is underline the reality that relationships in this lifestyle are as varied and unique as the individuals as in any relationship in the more plebian world.
For me, first and foremost a collar is an outward symbol of the relationship bewteen D. and I - I wear one all the time. He has provided me with a variety in order to satisfy convention and because the reality is that my favourite - a 2 inch leather black collar with an large silver "O" ring would not go down well in the conservative firm in which I work - I have some magnificant solid silver ones which I adore are are along the lines of a "slave" necklace (although I am a submissive,not a slave).
The collar, oddly enough, is more important to me than my wedding ring (yes, we are also more conventionally married as well) - and I actually don't wear my wedding ring as I don't care for rings of any kind.
But I find a sense of comfort, even nourishment when I feel my collar around my neck ... knowing he put it here, that I am cherisihed and valued and loved...