Dual Boxing Post 60

Does anyone here routinely dual box post 60?
I have a rogue/shm and I'm not sure if I'm doing it right, etc or if its even worth the time/money to dual box anymore.
The heals and buffs are nice, but if i Had to drop one I'd stay rogue.
I'm doing all the quests and even the collect quests which can slow me down but ensures they level together. Should I just ignore the collect quests on the SHM but use it to do them on the ROG?
I guess also ultimately I should decide if the heals/buffs are worth 15/month and 40 if i ever hit 70 +

Thanks for your thoughts/inputs!

It boils down to is two more fun for you then one?
Hundreds of players multi-box, but the vast majority of wow players play one toon at a time.

The 15 per month is not really all that much, compared to just about any other hobby.
I five-box, which is 75/mo, which compared to just about any other hobby is basically nothing.

Your kill power increases as you add more accounts and toons.
As you approach five toons, instances become more of an option as a place to level.
Collection quests become more of a pain, particularly in WotLK content.

Through BC, you can level 60-70 without having to do a whole lot of the collection quests.

What he said. --^

Also, if you configure a masterless setup, it helps a lot with collection quests (e.g. focus-based, FTL...). Often to the point that the more efficient collection quests are tolerable on a 5-box given sufficient motive. On a 2-box, most any collection quest that would be tolerable SOLO is still easily doable if you set up your system appropriately.

How do you handle looting on the other toons?
Right now I Just drag my mouse into the little window (I use maximizer from keyclone) and right click to loot.
Any more efficient way?