When I invest in physical gold (buy 100 grams for instance) and put it into real bank vault (no doubt I’ll pay commission for holding my physical gold in safe) when I'll came back in a year, two years, ten years or more, I’ll take back 100 grams of physical gold and no gram less.
Compare the cost of storing it in safe and buying the token. Which one is cheaper and with less hassle? You choose it.
Thirdly, if one day someone of investors of this project will say: “I want to exchange my Gold coins on my physical gold that is stored in your vault!” What will you do?
There is nothing they can do and neither it is purpose of the token.