First Time multiboxer

[MiRai]

So you guys are paying $70+ a month to blizzard for the multiple accounts?

If you're asking if you need one account per character, then the answer would be yes.

is there a trick to this?

If there was, then Blizzard would put a stop to that real quick. I don't know of any games that allow you to log multiple characters in from the same account at the same time.