"Buying yourself nice things" and "saving enough for retirement" aren't mutually exclusive for a lot of people. IMO, the way to go is to start off by figuring out how much you need to save, setting up your accounts to save that automatically, and then spending the rest guilt-free on whatever you want.
It has to do with the intention. If someone is planning to redirect these £€$ 5 per day (150 per month, 1825 per year) on something else, e.g. algo forex trading with a safe 0.20% profit per day, then those 5-per-day will become 650k in 10 years. I like my coffee just as the next guy, but if 'depriving myself' from the daily coffee will help me get to my F.I.R.E. [1,2] ten years sooner, then I am dropping it.
By the way I have quit drinking coffee (only decaf) and juices, but it was more of a health-choice than a financial one. But of course everyone decides what to do with their £€$ 5-per-day :)
