Many of you have probably have tried going to a Renting site expecting to scam them just by saying: "Oh it doesn't have any gametime" by now even they have gotten smarter and below are some things you can do to get a higher chance of letting them pay for it. You don't even need to have a Level 70 to get free time.
1. Get/Possess an Account with no playtime/money on it.
2. Visit a Character Renting Site
3. Talk to them on live chat, Make your character sound good with alot of epix and stuff.
4. They love to farm and pretty much keep accounts for long periods of time. If you tell them that in exchange you would like them to put gametime and let them rent for a whole week they usually agree.
*If you do not have a Level 70 Character* Go to Step 5
*If you do have a Level 70 Character Go to Step 6 or if you want extra security read 5 as well
5. Since you don't have a Level 70 Character and you have rented it to them, what they'll do is tend to delete your Characters after they put gametime on them. To prevent using one of your valueable restores, set up Parental Controls -Before- you rent it to the farmers and block it anywhere from A few hours - a day or two. This way, they can't even log on to check if you have a Level 70 and can't delete your other characters.
6. Now that you have all your characters intact and you have a nice Game Card or Credit Card on your account. Enjoy your WoW and your non-deleted characters. =)
This has worked for me and I'm now using some Renters Credit Card. Good luck!