I'm absolutely addicted to caffeine. But if that was the only reason you were getting it you would be happy with any caffeine containing substitute, which is most likely not the case.

I think with things like coffee there are a lot of factors that go into why we want it. Caffeine and taste are the obvious ones, but there is also things like taking a break from work, the chance to walk away from your desk for a bit (maybe even outside, depending on your location), sometimes a social aspect if you chat with the barrista or people in the queue. Even just being able to pick up and drink for a micro-break from your work without feeling like you are doing nothing while your brain processes something can be important.

Once you add all of those things in buying coffee starts to look like a better deal (which is probably why so many people resist the idea of cutting it out to save money) but it can also help you to think of other ways to meet the needs it is fulfulling if you do want to cut it out.