Originally Posted by MichaelW
With cheaper chains you can use 2 of them, one kept in cleaning solvent , and switch them every few weeks. This means that you dont have to take your bike out of action to keep the chain clean.
I wouldn't particularly recommend this. Just about any solvent that eats away dirt, grease and grit from a chain will also happily corrode the metal parts in your chain. Water is a major cause of chain corrosion if you just let it sit, and many popular degreasers (like Simple Green) are water-based. You could seriously weaken your chain by doing this, for little perceptible benefit.
The basic SRAM chains - PC-58, PC-59, etc - are excellent. When you pay for a more expensive chain, most of what you are paying for is probably reduced weight (some expensive, more rust-resistant chains exist, too).