Many people say all RuneScape Gold-Buying and Powerleveling sites are bad and/or give you viruses; they're wrong. I have power-leveled and bought gold for RuneScape before. I was searching for some websites... I found a website that seemed pretty reliable. "http://www.easyplaygame.com" was the address.
They sell rs 3 gold and runescape 2007 gold, power-level accounts, in-game items, member/free quest completion, and accounts. You can also sell your account on the website for real-world money. You can go in live-chat and find out how much your account is worth, when your order will be completed, etc. But be warned. You can be reported by other players who think you have broken any real-world laws. JaGex also has the ability to track the IP addresses that were used to login. "Hm, did this guy really fly to Asia?" I got caught power-leveling by JaGex and was banned for around 4-9 days? But this was after like 5 orders, hehe.
Also, some sites can hack your account for gold-farming, advertising, etc, but it's really rare, since they probably make their own accounts. Hope you don't get caught! ;D Happy cheating! (Edit): They transfer runescape 2007 gold with Bounty Hunter... How more obvious can it be? And they can't steal your credit-card number. You use PayPal... It's a trusted site, and they don't just redirect you to their "fake PayPal website."