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Farmers are in a competition for revenues. Better tractor technology growing more food with fewer workers. If all your neighbors are growing 200 bushels whenever you grow 100 bushels, you're going to die.
AWS simply won't be competitive with 90s era computers. Modern farmers won't work with tech designed in the 90s either. Sure, farming might be slower than computers at advancing, but its the same general thing. Computers (and tractors) are durable goods, they can last 20 years if you need them to. In practice, people replace durable goods regularly, because the NEW model is that much better than the old model.
So from that perspective, the economics between the computer world and farming world are probably the same. The group with superior technology will get superior revenue at lower ongoing costs. For computers, that's less power-usage for the same amount of computations (requests per second or whatever). For farmers, that's fewer workers picking your fields for the same amount of crop.