Andy, I hear what you're putting out put after buying Rotowounds, flatwounds and almost every other string in-between I just go into Guitar Center and buy a case of GHS Boomers or Elixirs for my basses and won't be back there for prolly 10 years for strings.
When I was playing out, I would go through a set more regularly (and I do you what you're talking about when you say "dead strings") and would change the entire set if I had one string go.
Always have to have a spare set!
On my Kramer-Ferrington...I haven't changed those in about 6 years. When I pick it up you can see exactly where I live on the fretboard!