I'm not sure the price of a cup of coffee is a good indication of something being inexpensive nowadays:
Sexagintuple Vanilla Bean Mocha Frappuccino, $55 [1].
[1] http://www.dailymail.co.uk/news/article-2641608/Is-worlds-ex...
[1] http://www.dailymail.co.uk/news/article-2641608/Is-worlds-ex...
The coffee I drink costs about $0.10 a cup.
Do people really consider a cup of coffee cheap? It seems expensive enough to be considered an occasional treat, not a daily purchase.
More relevant, "cups of coffee" is not a good unit of measurement and can be misleading. Just say the number and trust that people can cope.
Other offenders: Measuring distance in "cars lined up from here to the moon", expressing data in "Libraries of Congress", or expressing cost in $/day instead of $/month or $/year.
If I move to another city or If I decide I have time/money for the hobby I will do.
That's a lot of shots! How many espresso shots is enough to kill someone?