Yunalesca has never worn a collar. She absolutely hates them and she never tries to escape. I think as long as they have a microchip, it's fine. If they show no interest in trying to get outside, I think some are even fine without them, as long as they are an indoor cat.
Once my husband and I tried adopting a "stray". I swear, this cat was dirty and VERY thin. It had no collar or any sort of identification. It was winter and the poor thing kept trying to get inside our apartment ever time we opened our door (he had a habit of hanging out around our front door since we always gave him attention). One day, we decided we hated seeing him suffer in the cold and wanted to adopt him. So, he became a healthy indoor cat. We took him to the vet and started taking care of him. About 3 weeks later, we have a knock on our door. Some man saying his niece's cat is in our window.
Of course, we gave him back. Although, it makes me wonder. WHAT IS THE POINT OF OWNING A CAT IF YOU DON'T EVEN TAKE CARE OF IT? And why in the hell would you try to take that cat from a loving and warm enviroment so it could just suffer in the cold again????
That was just a story about a cat without a collar.
Hehe... sorry I got side tracked.
No, I don't think there is anything wrong with you cat not having a collar.