As long as u follow the rules. And dont buy a crazy amount at once you should be fine..
Rulez typically are.. no communication. No adding.. ignore your chat..
Always people trying to scam.. and yea they will try to add you or talk to you... so always follow the sites rules to be safe.
If your buying gold to say rush some low skill up so u can make gold... go for it.. (im averaging 1-10m a day on slayer 75+ that is with me cannoning everything i can and using my gp to make everything as fast as possible) depends on how long played to. (Recently hit 85 slay.. just keep making more and more the higher it goes)
But if your buying gold to say buy an item ? Dont do it.
Why ? Because the moment u get one of your skills to a higher level where it produces gp.. you will find yourself making a nice amount.