Sorry, I haven't read all the replies, Originally, A 7 day set was a status symbol. Most guys had one razor, let alone two. 7 day sets were for the wealthy, or well to do.
Even now, 7 day sets will run you well over 1000.00 in most case. I see a few here and there for 750.00, and they're very plain. Most barbers use a towel to wipe the soap/cream off the razor. Rinsing is fine, just be careful. I use hot water, and feel it adds to the shave. As far the edge needing to rest, well, that is a myth....