This question only goes out to those like myself who enjoy the system gains running better cables bring. Non-believers can save their money and comments for another thread.
Do you impose on yourself a percentage range for cable spending relative to other components?
Speaking for myself, I do consider cables to be a component decision worthy of budget, but I seem to have stayed in the 10-30% range of what I've spent on other components. I can't see spending $1k for a cable on a $1k component for example. I have spent $1,500 for speaker cables for a $6k amp. That seems nearer the high end of my range but it still fits.
I realized I haven't planned this as a hard rule, but that's kind of how this has worked out for me over time. Anyone out there think a much higher percentage is justified? I won't argue because these improvements are worth all the enjoyment you can get, so more power to you.