Not quite like 'getting the wrong change at Wal-Mart', and more like 'I did all this work, set up a multi million dollar product, and they took it over, ruined it, and payed me less than half for it than I was contracted to recieve'.
It has less, for me, to do with the money, than the principle. If someone owed me 1 Billion Dollars, and only gave me 500 mill, I wouldn't need the other 500 mill, but not giving it to me is STEALING...