I run 3 saws semi-regularly year round and also process 5 cord for my own heating requirements each season.
My big saw has 3 chains... 2 of those chains are nearing 4 years old with several sharpenings and countless filings in the field.
A lot of folks don't take the time to pull the rakers down so no matter how sharp the chisels are, the chain will still cut like crap with full rakers in place.
Also, many of the halfway decent chains will have a sharpening limit etched into the top of the chisels. That line defines how small the chisels can be while still being effective at their job.
I agree with DickR that there is money being thrown away on replacement chains if they're being tossed after 2 visits to the grinding wheel.
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