I don't think you're strange one bit and like others I just don't lose tubes, socks or cases. I believe that some people get into this on a lark and having no reverence for the sport or equipment gear is treated carelessly perhaps.
I sold a Lamson Velocity 3.5 a few years back without the box
I just couldn't find it! About six months after the sale I found the original box and warranty papers in the basement storage....................
On Craigslist nothing would surprise me as to why rods without tubes may be for sale.