Gold is a currency in BABFT. Gold can be earned by creating a boat, then passing Stages. It can be spent on items in shop, buying more saving slots, or loading overwritten saves . Gold is given based on how far you travel inside the map, not above or below it. The game knows when you passed a Stage because when you touch the black part at the end of a Stage, the game adds 4 (or 5 with +25% gold group perk) to the Earned Gold value. When you die the Gold Earned gets added to your balance. If you close the game (or lose connection to the server) before you actually got your earned gold, it will NOT be added to your balance. Since Wheel Boats and Jet packs go outside of the Stages the game does not count that as travelling. Rocket Wheel is sometimes in the map and sometimes out of it so it usually gives around 4-80 Gold. Sometimes you will get a Gold Block when you reach the treasure but not the max amount of gold.
The most gold anyone can obtain at once is 3000, which is obtained when you use the alternative method to be the Soccer Ball Quest