The other nice thing about having your own sharpening capability is that you can touch up the chain in little time and be off cutting. If you take the chain somewhere, you've got travel time for two trips, once to drop off and another to go pick it up who knows how many days later. Sharpening chains isn't rocket science, and some places have a school kid come in a couple days a week to do the accumulated chains.
Replacing a chain after only two sharpenings leaves a lot of useful chain life behind. Either that or a power sharpener has been used too aggressively, overheating the metal and taking off too much metal. Granted, a new chain doesn't cost all that much, so that more frequent replacement of a chain that sees very limited use isn't that big a hit. I prefer to get all I can out of them, swapping out a chain for a sharp one from my collection, then tuning up the duller ones all together.
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