I smoked pipes for over 25 years before I ever heard the word rotation used in the context of pipe smoking.That didn't come along untill I got online.Most pipe smokers that I knew pre internet only had one or two pipes.In those days though one could buy pipes for just a few bucks,so I bought a lot.Not because I thought I needed them,but just because I wanted them.Later on when by chance I got a couple of really good smoking pipes I realized that I had wasted a good deal of money on pipes that I eventually got rid of.I'm not saying that rotation isn't a good thing.What I'm trying to say to someone just starting to buy pipes.Put back enough bucks to buy better smoking pipes.The rotation will soon enough take care of it's self.That way you won't end up as I did with a large rotation of not so good smokers,and losing money later on trying to get rid of them that you could have used to buy pipes that you could enjoy for a life time.Anyway that's my opinion on this topic.Of course others may have different thoughts.