It very well may be that income is a confounding variable. Being able to afford 3-5 cups/day means you’re more likely to have a relatively high income, and thus a better health situation.
This is false: http://news.gallup.com/poll/184388/americans-coffee-consumpt...
”Fewer lower-income than higher-income Americans drink coffee, but lower-income coffee drinkers consume more cups per day than higher-income coffee drinkers (3.8 vs. 2.4 cups, on average)."
Low income Americans driink either a lot or not any coffee at all. High income Americans drink some coffee.
So you would expect no coffee consumption and high coffee consumption to correlate with a higher risk than moderate consumption. This is exactly what the study found.
You can buy a coffee maker for $12 on Amazon. Ground coffee is $7 for 12 oz or so, and you can make a pot of coffee (12 cups) a day for a couple weeks from that.
It's pretty durn cheap. It's probably the cheapest beverage other than tap water.
Also, when it says 3-5 cups a day, that's the measurement unit "cup", not what most people would think of as "a cup of coffee". A typical size cup/mug of coffee is usually about 3-4 cups.
If you are an espresso drinker, it’s worth mentioning that a cup of brewed coffee contains almost 50% more caffeine than a single shot espresso. So we are talking about roughly 2-4 double shot espresso coffees per day.