When my wife and I lived in London, we'd often go to a little chain of restaurants called Pierre Victoire. Back in the 1990s you could get a three course meal and a glass of wine for £4.99.
It was excellent value and very tasty. My wife used to be in catering and she would often comment on how they brought the cost down: smaller portions, using cheaper vegetables like carrots, warming the cheap red wine slightly to make it taste better and so on.
And then Pierre Victoire put the price up to £5.99. Same good food, still excellent value...
... but we stopped going. There was something about that extra pound that meant it no longer seemed like such a bargain. I don't know, maybe it was the difference between paying for two meals with a tenner and with having to pull out a note and then scrabble for two more coins.
There are lots of occasions in life when a tiny change makes all the difference. My wife calls these changes a Pierre Victoire Event. You can read an Emacs example of this here on my Tech blog