TBC multibox heroic gold farm worth ?

Hey, i wanted to know if spam heroic in tbc was worth to gain some gold.

How is it compare to daily farm with 5 toons or old instance farm ?

was making a good chunk of gold when farming lower city rep in shadowlab nhc, first room and 3 pillars upstairs without the felguards. Im not sure farming HC yields more gold unless you are super fast with clearing. Also got 2 blinkstrike on my way to exaltet so that trash worked well for me.