[gregjor]

You have different kinds of friends than I do, I guess. If I went out with someone who quibbled abut a few pennies, or even a few dollars (or pounds, or yen), I would insist they get their own check from now on.

Personally I have never participated in a meal that ended with everyone going over the receipt and paying for exactly what they ate down to a few cents. I would consider that miserly, ruining the experience. Why go out at all if you have to carefully monitor every nickel and dime, and worry that someone might cheat you out of a few coins?

[wirelesspotat]

That's a fair point - it can vary a lot between groups and it can certainly relate to life stage / situation. Students and roommates are a large portion of the market for bill splitting apps. In my experience those groups tend to care more about splitting things accurately / fairly, perhaps as they have a more limited income