Hi there! First of all... welcome aboard!

When I started out with this straight razor shaving thing I wondered exactly the same. If we are, in principle, saving the money we won't spend in cartridges and disposable blades... why is it that 7 day sets exist? And do I really need more than one razor?

Well... at the time I made enquires myself as to find out why... I had heard that a blade needed to rest for at least 24 to 48 hours in order to allow the metal to re-shape after a shave. I concluded that it was some sort of a myth, or rather an excuse for us to use in order to fool our wives when the "new" razor arrives: "the others have to rest for some time and I cannot afford to look scruffy at work, dear..." Now seriously... this is what I concluded: you will most definitely need 2 razors, no more than that. That's because you'll need a razor that is up to the job every day. The resting thing is a myth. In fact, if you have the means and the skill to touch up your razor from time to time, one razor is all you'll ever need. More than 2 - let's allow this... -is collecting. And if you already have 2... you can start up from there. Some members here have way more than 2 razors, I believe...

Seven day sets have no real practical reason, in my view. It's a luxury thing - something you buy because you can afford it. Generally speaking, seven day sets are very well crafted sets and have precious details that, quite often, in the past, were bespoke. These were symbols of status and, shaving-wise, have no purpose whatsoever. Some will argue my view and say that there is a very clear practical reason for the 7 day sets namely the possibility of getting a daily shave with exactly the same benchmark and the possibility of spacing the touch ups and the periodical honing to once every 2 or 3 years... at least that's what I heard!

I'm sure other more experienced guys will chime in and provide better information than this. But anyway... this is my opinion! Hope it helps!