I've seen people do that too. I remember being in the LV store and someone came in and asked for the exact same bag they were carrying. Even when I only carried one bag until it wore out, I was always excited to get a new style the next time around.Many people buy a bag and use it until it's too worn out or they get sick of it, then they get a new bag and start over again. For some reason I see a lot of LV bags used like this, they will be worn through and falling apart and the owners don't seem to mind. Maybe they want to get their money's worth? One lady with such a bag finally decided to replace her LV neverfull after it wore out competely, and what did she replace it with? The exact same bag. I can't imagine using the same bag for years and years.
Personally I've always liked a variety of bags and like to change bags every couple of days, so yes, I use all my older bags. Because I rotate through them they seem to look like new for years.
Lately I change bags about once a week.