Yeah honest buyers do exist of course
but you need build up a reputation with these members on the forum if you want to sell stuff easily, and that takes time. Would you send money to a random dude on the internet? If your a honest seller get people to comment on your threads after the transaction has been completed. Alot of people recommend requesting a trade on the forum (I don't know how this works) for more respectable feedback. Selling is slow on here at best of times though TBH as alot of people wont take the risk.