It is one an the same problem - money/time trade-off. Which one is worth more to you? It depends. I've worked at organisations where "get N extra servers" was

It is one an the same problem - money/time trade-off. Which one is worth more to you? It depends. I've worked at organisations where "get N extra servers" was a 6-8 month process. Because of this you have to be extremely good at capacity planning. And very few organisations are good at these guessing games. Either you over-provision with a generous safety margin; or you don't - and your fail to handle peak loads.