Let's say you're going to use this for 3 years and it becomes worthless after that. $1,800 / (3 * 365) = $1.64 a day In reality you could still probably sell

Let's say you're going to use this for 3 years and it becomes worthless after that. $1,800 / (3 * 365) = $1.64 a day In reality you could still probably sell it for at least $500 at the end of the term bringing the cost down to $1.19 a day. And with inflation where it is, you're locking in the current price with today's dollars. If it's something you'll use every day adding the RAM you need I think is an easy decision.