The Last Outpost of Common Sense

For example:

30+ years ago, a parcel of property is purchased for $59,900. The Supervisor of assessments generates a tax bill based on that valuation. Fast forward to the present…..The same property is now appraised at $247,900. The Supervisor of Assessments generates a tax bill based on the current appraisal. WTH! Why does arbitrary valuation create a higher tax bill for something that is not even income?