Congratulations on the lauch to app store.
I had the same idea; count no. of coffees, no. of cigarettes, no. of people, etc. A way to keep accountability about something.
I think swiping would fit better though, although there could be a lot of swiping happening if you've got a few counters.
Also, editable titles would let you name your counter.
Unfortunately I don't have an iPhone or any of the i-family gadgets.