My coffee shop charges $1.50 for coffee, if I bring my own cup. $1.75 if I don't.
A pound of good coffee is $15. It makes about 35 cups. A medium coffee is 1.5 cups. That's about 65c a cup. But you might need to add sugar and cream. 2 tsp of cream is about 12c. How much for sugar? 2c, perhaps? So that's about 80c for a cup of coffee. And they do all the dishes for you. Plus you aren't throwing out any coffee or anything like that. So, given wastage from leftover coffee and cream, perhaps it works out to 90c to make your own cup of coffee.
But...when I go to the store...I get to read a newspaper for free. That would cost another $1. So I'm actually ahead by going to a coffee shop, if I read a paper. I always try to read two.
You forgot the filter and/or coffee maker depreciation. We use a cheap plastic holder, and coffee filters that cost about 5c each. Ok.. it probably isn't fair to count the cost of the holder - it was probably under $2, and it's lived through at least 100 cups of coffee (and going strong, I might add..) I calculated it all out once to try to explain to my husband why I wanted him to make coffee at home. He didn't think that it was worth 60c to stay home for his coffee. Unless I was the one that made it. He doesn't complain about the quality of the Trader Joe's fair trade organic (that I get for <$9 a pound), either.
Me? I stopped drinking coffee. Bad for my blood sugar anyway.
And to be fair, we DO have at least two different coffee shops that roast their own beans around here... I figure that if he buys (pre-made) coffee from them occasionally, I can feel a little less guilty about buying TJ's coffee beans!