Basically the game uses hexes a lot and the maximum value for the gold is represented as 0x7FFFFFFF. The Fields used represent a Constant minValue and maxValue of the Gold. The actual minValue of the hexadecimal int32 would be 0x80000000 or -2,147,483,648.
This isn't only restricted to the gold value, obviously, and can be used to manipulate the character names, too, with different hex codes. Each letter of the name could appear in a different color, given enough space for the character name input. I'm not sure what the maximal value is, but this can be manipulated with all things which are assigned to different hexadecimals. Even icons (signs) themselves could be colored this way by a variety of different hexadecimal outputs.