Why would you choose enamaled cast iron for camping, PJ?
There are a lot of benefits to going with raw cast iron. For starters, a camp kettle tends to be abused as compared to one you use at home, and that can lead to cracking and chipping of the enamel.
With raw cast iron you have a greater choice of sizes and configurations. And it's certainly less expensive than the coated stuff---even more so if you shop around and buy used.
Give you an example of what you can find. My last true Dutch oven, a 14" model, cost me only 40 bucks at a flea market. Other kettles and Dutch ovens have run me as little as $10. But even new, raw cast iron isn't too expensive. I have a 12 inch "Dutch oven" (actually kettle) I bought new, that I've often used as a deep fryer. Paid $60 for it.
It's incredible what you can find. Although I passed on it, cuz I had no way to display it, and certainly no practical use, I recently saw a 20-gallon cauldron, complete with detatchable bail, for only $100.
While it's true that collectors have run the prices up on some makes and models, this doesn't apply across the board. If you're looking for a practical piece, rather than something to hang on the wall, there still are bargains out there.
They have taken the oath of the brother in blood, in leavened bread and salt. Rudyard Kipling