Ebayer all_uk_trade posted the following as a guide:
"As most of the runescape players are aware , jagex has introduced a way to stop real life traders from purchasing runescape gold online , there are currently hundreds of theese sites set up which have taken a final blow to their buissness , if you ever see people buying or selling runescape items or accounts on ebay avoid them ! it is illegal and most probably a scam , thanks to runescape they have cut down dramatically after there last update , if you need to know more about this don't hesitate to contact me . have a happy christmas and avoit those scammers !!"
Please be informed that this person purchases such accounts on website sythe.org under the identity d_j_n_r_g - he's one of the scammers he's warning you about. Please be wary.