Ye, but there is also other ways to get gold on if you got only 1 lvl 90 and do not wish to remove engineering. You could get herbing or mining (i'd take mining) and bot with gatherbuddy otherwise you could get a grinding profile and farm for example rivendare deathcharger or farm skyshards for alani mount and sell it and if you are lucky you should get some epics during the farm of skyshards and those is a boost of gold aswell so that's great. What i've would've done is to level up mroe lvl 90s and get as many proffesions as possible to maxlevel. I would recommend to have take this ones first for as much gold as possible to gather: Mining>Herbing>Jewelcrafting>Enchanting>Alchemy>inscripton and so on. Now last time i tried this was during cata and had lots of gold all the time never had to worry about anything and what i did was that i mined and herbed, the ores went straight to my JC who prospected everything and then sended it to my enchanter who disenchanted everything and sold the mats both fast and for alot of gold. The herb flowers i gathered was mailed to my Alchemy who then made flasks and sold them all. Now i don't know how it's for MoP but it should be about something in that way. But i can say this much the more 90s you got the more gold you can get in same for the amount of accounts you got the more accounts the more gold just as easy as 1+1. Hope this helped GL =).
Edit: Also Gatherbuddy should be in honorbuddy when you buy it so yea you should have it alredy and it shouldn't cost you anything extra to get, in other words Gatherbuddy is "free"