Now in my opinion, a pipe doesn't necessarily need resting. What I have found out, especially with the lower grade pipes, is that if you smoke them day in and day out (which happened in my early days as I could only afford a couple of pipes) you do have to clean them more often. Since I am a very comfortable individual, I do prefer the rotation - I don't have to get my hands dirty too often and it allows for diversification as well. While I am not a ferm believer in pipe resting, I am of the opinion - and most guys here would agree with me, that certain tobaccos ghost. So if I fancy a certain tobacco today and not tomorrow, a haunting tobacco I mean, inevitably my pipe will rest. Long story short, while trying to avoid cleaning pipes too often I feel comfortable with respecting the 1 bowl = 1 day rest rule, but if I want to smoke the heck out of a pipe just because I feel like it, I have no drawbacks.