I think I was the first to think this one up, as i havnt seen it before,
its pretty simple, make a trial account and lvl it to 5 or 10, then go on a WoW trade site or whatever or even find someone ingame who braggs about havin high lvl alts, then say "Wow! your awesome! can u maybe level my character 1 or two levels?" for me a couple guys said yes for me. Then if he sais ok, say "hey, i dont want to get really bored so can I play on yours? I want to try a flying mount (or Whatever)" if he sais yes then yay for you, give him your trial account info, its pretty hard to notice your on a trial unless you try to trade or mail. for me, i got on his account and I sold everything he had, and mailed the cash to my main. Unbannable i think cus he gave you his info