The wearing of a cock ring in my opinion, is not necessarily a sexual thing. Like you I wear one under my clothes at work, or doing chores. I've also worn it on the beach. Others will disagree but to me it's like wearing a watch.(the sensation I feel is purely for me to enjoy)
I guess it's a mix for me, not for arousal so much as a general feeling of giving a kind of support, a little constriction and swing as I move around due to the weight and being a point around which my parts pivot. It doesn't make me any bigger (not even a little!) but does make me more prominent in addition to the extra swing. It feels different to not wearing one and between different weights.
The aesthetic aspect is also nice although I was self conscious wearing them to the beach at first, but decided to push ahead and not look back. Being metal and of significant (varying) size, I expect they shine quite a bit in the sun. At textile beaches they certainly help the definition beneath the fabric of my swim briefs but are not noticeable themselves except under thin or mesh fabrics where they shine through in the sun.