I did the /script SILVER_PER_GOLD=(50)
But, and BUT, when I did this, my money was 1 gold 42 silver. (my original gold was 92 silver 64 copper.
Blizzard will nurf this quickly, so do this on a private server:
Write down how much you had originally
Do /script SILVER_PER_GOLD=(50)
Left click on your money, move it to your slot.
Buy something to test it, a loaf of bread, for example.
Log out
Log back in
You will prob have bread and the same amount of Gold (or silver)
I tested it, and I'm not sure if it works.
PLEASE DO NOT FLAME, just tell me if it works or not.