What's that razor worth?

Or rather...what's that razor worth...to you? How bad do you want it, and what are you willing to pay? And finally, what criteria are you basing your decision on? Condition? Rarity? With the case and instruction sheet included?

I pretty much just jumped into my first purchase, a 1951 Gillette Milord Super Speed. Most of the gold was worn away, but it was clean, operated flawlessly, and was relatively scratch-free. The seller was close by, had excellent feedback, and offered free shipping. I soon became a bit more selective, and doing research first before buying. The Milord was a good shaver, no doubt, but I could have done better. My second razor was a post-war, NDC (no date code, being made before 1951) ball-end Tech. It was in near-mint condition, but I probably paid more than if I'd been more patient and waited. (It is, by the way, a superb razor when coupled with the right blade.) So, I learned to wait, and resist impulse buying. There are exceptions to this; however, it again depends on what you're wanting. 

I've made nearly all of my purchases off "that auction site", checking the "ending soonest" first, then the "newly listed". And most have been determined by a combination of condition and price. If I find something that interests me, I'll do a specific search for other similar razors to find the best condition for the cheapest price. The most I've paid was $47.05 for a mint 1947 Milord, with the case. Too much? Maybe, but I was willing to pay that. I've lost a few because I thought the price was too high...for me. But someone else didn't. If you miss one, though, there will always be another one showing up. That's where patience pays off.

I really wasn't concerned with cases and instruction sheets, since I had made a stand (of sorts) to display all my razors. I think I have six in their correct (I think) cases. Which comes to this: Is that Type E Schick injector or Simplex Contract in its correct box? That's probably easier to determine than if that vintage Gillette Oxford is in the case that the Berkshire came in (in all probability, they're the same case; Gillette was known to use the same case for different razors). Cases do come in handy, though, especially for traveling. My NOS 1945 Contract Tech came with the correct hard clamshell case; it's my favorite when I'm on the road (performs extremely well with Polsilver blades). And in some instances, the case is a must-have. Why buy a short-handled "travel razor" if it doesn't have the case?