So when buying gold bars the cost dont raise within the single purchase..? Does it act the same when selling, if so whats to stop one from buying a lot then just selling it right back

The price is adjusted within a single purchase. For every 25 bars bought / sold, the price changes.

Ok, do you know the rate at which it changes?

The new formula is now:

Gold Bars Price = -0.01*Market Stock + 3000

The new formula will allow up to 225K per market before gold bars reach their minimum price.
The formula update, has changed all market prices upwards.

Thank you