I was perfectly happy squirting on the teflon chain lube until yesterday.
Now I'm looking at ~$200 for a new chain and set of sprockets. I figure that if I'm planning on keeping the bike for more than 14k more miles (two service intervals) it will pay off getting one and switching to an oil chain lube.
Hadn't quite realized how much a pain in the ass it can be when I'm too lazy to be constantly maintaining the chain. (First bike with a chain) Ignored the chain for a good 1.5k - 2k miles except for an occasional squirt with the generic Teflon lube, and I now have the horror of a having to tighten the chain. The horror.