There are a lot of gold spamming ads, and Blizzard is trying to cut down on them, but if Blizzard catches you buying cheap wow gold (and it is very easy for them to do) your account will be banned forever with no hope of ever getting it back.
Of course, the gold spammers know this but they don't care - they're trying to trick people who don't know into buying wow gold safe buy to make the spammers real money - if the buyer loses their account - oh well! The seller doesn't care.
Most of the time, the gold sellers are scammers, anyway - they take your credit card information, and ask for your account information - your account name and password - "because we need to go into your account to place the wow gold buy safe" which is a lie - if they wanted to send people gold, all they would have to do is send it via in-game mail by one of their own accounts - but here's the deal - a lot of people buy wow safe buy gold, then the following happens (and I've seen this reported hundreds of times):
First of all: they never get the gold. The seller reports "they are currently experiencing a high volume of orders" and "will get it to you ASAP as it becomes available". Which, of course, never happens.
Then: they access your account, including your wow safe gold buy member account, and get access to your credit card. Then you suddenly see unexplained charges on your credit card, become the victim of ID theft, all kinds of problems.
Another: you sign onto your account and find that all your character's gear is missing - and all the safe buy wow gold you had --- the gold sellers sold all your gear, took all your money, to pay other person their gold (or not)
Last: you try to contact their "24/7 live customer service helpline or online live customer care" and find it is disconnected or never worked in the first place, or they merely tell you to wait for your wow gold buy safe which never arrive. .it's a scam in the first place, and you risk your entire financial health by playing with these con-artists, it's secondly against Blizzard's Terms of Service, (TOS) which results in you getting banned from playing WOW ever again.