Once you've invested in your home espresso equipment (mine is a Gaggia Classic bought for $250 15 years ago) my average for basic supply costs (coffee beans and milk) is still less than gum. I'd say about 0.18 cents for a shot of espresso, and about 0.30 cents for a great cappuccino. Taste-wise, I never tried gum or other caffeinated drinks, but I'm sure the daily ritual of grinding the beans and pulling the perfect shot of espresso, not to mention its taste, cannot be compared to a piece of gum.
The Gaggia looks really nice. I admit I don't know a lot about coffee machines, but the best cup I've had came from a Nescafe Diolce Gusto. Did you shop around and choose the Gaggia for a specific reason?
Mine is a Gaggia Classic, the plain-Jane version of the one on your picture. The Classic is simply the 1970s Volvo station-wagon of the coffee world. No frills or luxury, but a solidly-built, affordable, durable and reliable semi-automatic machine, that will give you a great shot of espresso day after day, year after year. And it looks good in the kitchen, with its shiny and stylish stainless-steel body that hasn't changed since it was first commercialized, back in the eighties. The Gaggia Classic consistently rates as the best pump-driven semi-automatic home espresso machine, as you will see from all the positive reviews. If your budget is a bit higher, the next best machine is the Silvia Rancilio, practically the same machine but with a larger boiler, but also almost twice as expensive. Using a semi-automatic machine involves a few more steps than a very predictable Nescafé Dolce Gusto (I have a similar Nespresso model at my office that gives a decent cup of espresso, but nothing more, and at about $1 a cup), but you will enjoy the results and the infinite possibilities that such machines give the coffee lover when you are ready to experiment with beans, roast, and grind. Whatever machine you chose, the next most important factor is the grinder: a high quality grinder will make all the difference in the world. My wife and I will soon be moving into our 400 sq.ft. cabin, and we will have to pare down our possessions, but my Gaggia machine and grinder are the only appliances that I am not getting rid of.
My wife's smile, after the first sip of the morning cappuccino I make for her every morning, is priceless.