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I would say that it is unusual for your cables to be failing so often.
Is there anything having to do with your setup (particularly the lo-limit adjustment screw) that is causing high force/effort to be applied to the main shift lever?
Is any (particularly the rear-most) length of cable housing perhaps dry, dirty, distorted/bent or otherwise not allowing the cable to move freely?
The shift to the largest rear sprocket should not require any more force at the lever than the shift up to the second-largest sprocket. If so, then the lo-limit screw must be too tight. That will kill cables.
The cable guide under the bottom bracket may have become dry, dirty or contaminated by dried sports beverage, so applying lube there every time that you lube the chain might allow the cable to move with less force and thus less frequent replacement.
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