Playerauction is a load of shit, I know plenty of friends that tried to legitly sell/buy on their website and got suspended for unknown reasons, claimed their support wouldnt tell them or help them out at all. I dont even use that place.
I still manage to sell gold myself for 16/100 mil on RMAH so I wouldnt sell lower than 15$/100mil myself, but before I would bot I used to buy from
http://www.mmogoldbay.com/. I've used them at least 10 times and never had any problems, I also used this coupon godisagirl which right now 100mil is 9$ there but coupon gets you it for 8.74$/100mil. I also just saw someone selling a billion for 80$ in this forum:
http://www.ownedcore.com/forums/diab...uy-sell-trade/. Whenever I bought from mmogoldbay it would take like 5-10 minutes for them to add me to friends ingame and trade, all they ask is that you reply to the email they send you as confirmation. Sometimes I prefer to add them to skype to help speed up the process if it's been more than 5.
All I can say is, I've bought probably 2bil out of game and never been banned for it, so I wouldnt worry about that. As a botter, if I were looking to buy gold, I would post on that ownedcore forum, look at the current rate of what people are selling it for, maybe offer slightly lower in a new forum post. I mean 80$ for 1 bil is awesome, buying through D3 RMAH is a waste of money, you have to think that botters are slowly selling their gold for 16$/100 mil ingame, so any chance to sell in bulk out of game they will most likely take. I know plenty of people bitching about billions not selling all at once, so the opportunity is out there. The fact that the gold website (mmogoldbay above) sells for $9, also tells you that there are people selling to them for less than that, obviously, or how would they be making a profit selling at $9?
Keep in mind that the reason gold is so cheap right now is because there hasnt been a real banwave in about 2 months, so gold will keep decreasing until a banwave happens. I thought it would have by now but maybe once they release the item revamp patch, they'll ban some people to help bring gem/gold prices back up. So you could technically buy some gold, sit on it and wait for ban then sell. The gold might not go up much for very long but it will, but then you'd need to find a buyer outside of game, cause gold will still be at 25$/100mil ingame.. it'll just sell faster
feel free to pm me if you have anymore questions.