Buying gold is very  easy. But the problem is when it comes to selling. The process of selling gold appears to be much more complicated.
You have to find a buyer...then you have to find a buyer that will give you a good price for it. Good luck with that.

Then you have to deal with the logistics of physically delivering the gold to the buyer, how to receive payment, etc.

You and the buyer have to meet to make the exchange, which can present security issues.
But if the buyer isn't near you then you have to deliver the gold by mail or shipping service.
But does the buyer pay you first? Or do you send the gold to the buyer first? The risk of getting scammed is very high for both buyer and seller.

The risk for the buyer is how does he know he is getting real gold and not fake or diluted gold?

In the US the fastest and simplest method of selling gold is to go into your local pawn shop but who will give you less than half of what its worth and you end up losing a lot of money.

By comparison, bitcoin is extremely quick and easy to sell with a few keyboard clicks on your computer or phone app.