The only thing I can add to everyone else's suggestions (which are excellent) would be to question the chain tension. I keep my V-Strom chain loose enough to be able to almost touch the bottom of the swing arm when fully loaded on the side stand. Your photo seems to show that yours is quite a bit tighter than that. I don't think the tension is causing the wear but I'd loosen it before checking the bearings etc. I believe chain tension usually takes out the seal and or bearing on the output shaft rather than the rear wheel bearing and your seal is obviously not leaking but maybe you got lucky?
Roger
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