Well those coins weren't stablecoin so apparently the volatility associated with all cryptocurrency affect the price of the coins. Manipulation and loss of interest from current and potential investors contributed to the down fall of those project and off course, most of them were disguise scam profiting from the hype that was associated with gold backed projects. Understand again, Gold token is a stablecoin meaning you can be assured of a fixed price backed be real Gold as explained on the website.
Just like any tradable assets or currency, the price of Gold token on an exchange is totally dependant on the trading activities of that exchange that's why the price differs on various exchange although within a certain price range. The external exchange listing were introduced to increase awareness and adoption of the stablecoin. You can always used the inbuilt exchange on the website if you feel the price on the exchanges doesn't suit you or it's been manipulated. Other stablecoin also experience price difference on different exchange based on how active the market is, on that exchange.
Dear CryptopreneurBrainboss,
We got a response from the devs. They promise to do that in the future updates.
Regards,
Support Team @ Digital Gold
https://gold.storage