> if you have a cluster of servers where serving 1000 requests a second might cost $1000, you can instead use the cache to store the responses and serve it from

> if you have a cluster of servers where serving 1000 requests a second might cost $1000, you can instead use the cache to store the responses and serve it from that cache server instead. Then you would have a small cluster for $100 and a cheap and large cache cluster of servers maybe for another $100. The numbers are just examples to illustrate the point. Reddit needs to implement this if they want to get to the next level.