My main a large eb fairy. Always upgrading, always keeping allies at mp level. At what point should I say heck with upgrading and save up for a big ally, like a trillion? Will it make me better gold in Eb's? Never been clear on that.seems like upgrading has grown me pretty good.
Just continue upgrading. The stat increase from allies is small, and is pretty much useless in epic battles.
It's better to shop smaller market allies that will sell and once one sells then buy a big ally.. It's more effiecient than just saving up
In the end, do whatever you want. Some people just wanna upgrade. Some like BFA. Some like having a 20t ally.
One big ally won't make a lick of difference.. You need a bunch of big ones for the bfa to help.. Better to just use allies for trading at your size, meaning only buy decent ones that will sell 1mil cs for every 50bil value is a good gauge to know if it is a good market buy
Then that change was with t6 lvl 4-5 as far as I know it has been 27 bill since t4 and was still true with t6 lvl 3