I have used this site a few times total. Here is the honest truth of what your going to expect.
First, it depends on the game. Games that the can farm gold easy on will have a better chance of you not being ripped off.
Second, it all depends on the amount your buying. Higher amounts that will be harder to farm will lead to you losing your money.
This site is not as "well regulated" as you might be lead to beleive. I recommend finding a different site that might have better reviews.
This gold selling site really isn't the most reliable. If you choose this one, it's like putting all your money on a number on a roulette table. It will be a gamble as to your getting your gold or not.
Last thing, PayPal will NOT refund your money if Zamgold shows them your message with your username and a screenshot of them "trading" a bot that has your username but was edited to look as such. Happened to a friend of mine who didn't heed my warning. PayPal showed him the "evidence" and he was pissed.
Services had been rendered and a refund will not be possible is the message PayPal gave him.
Thought I would update my review. Thanks for reading. BP