Buying BTC from a forum member is stupidity, even if the member has high green rating of trust your money can corrupt the person into giving up his or her account, we have exchanges for buying and selling coins, they are lot safer
I will call stupidity if :
- You make a transactions without looking the seller's background and not doing due diligence.
- You make a large purchases at first transactions.
Don't forget, at the beginning of the presence of this forum, there are many buying and selling activities among forum members.
But I also agree with your statement, exchange is still the best place for buying and selling activities.