Thanks for the suggestion about Kool mist. I'll look into that or similar products and see how that works.
What will I gain? The satisfaction of doing a job well done. If I can do some task better, I will - it is how I am - and won't settle for bad work. The number of chains I sharpen is irrelevant. I'm surprised you even asked this question - isn't this whole website about doing it well yourself? Somebody recently spent around 10K here for a PM lathe - and is is setting about learning how to use it. I think what he is doing is outstanding! Does it make financial sense? I'll let you answer that.
I hand file my chains more than a few times between using the grinder. I've also offered to sharpen chains for some friends and I'd hate to return one with soft teeth (most of them know very little about sharpening). I've watched garden shop guys take a huge bite off the teeth - and Amish small motor shops do the same. I've had chains returned with half of the tooth gone.
Nuff said.