My favorite shave is a TI and I've used it daily a lot. I recently aquired a Dovo and started rotating them but I keep coming back to the TI...probably because I haven't got the Dove honed to where I want it yet.

I've noticed no difference in using the TI every day vs every other day. The only reason I can see for multiple razors is delaying the need to re-hone as long as possible. As tough as my beard is I need to hit the hones monthly whereas if I had a 7 day set I would only need to hone a couple times a year. So I guess you can pick your poison...hone one razor a month or several at a time (or in rapid succession if they don't all go dull at the same time) or some variation on that theme depending on frequency of use.