I'd say that if you don't maintain your chain, Ti or not, it won't last long. Rust won't attack it but it will still wear out quickly. I'm a bit of a maniac but I wipe my chain after every ride with a rag (same with RD pulleys, chainrings), then add a minimal amount of Teflon based lubricant.
That said, 3-4x the price of a regular chain is a very good price!
I really need to visit Asia...