TBC, why not?

Hello, guys, I came up with this question some time ago: why not launch a server The Burning Crusade?
I confess that I do not know the difficulties, maybe it's just nostalgia, but I know some people who share the desire to play this expansion again.

PS: I apologize if this question has already been raised and answered, I did not find any topic about it.
PS2: I do not write English so fluently, I used a translator. XD

Because there are already TBC servers out there and we don't wish to stretch our development team thinner than what they already are.