NCB cost (in General)

So how much CB savings does it take to be able to buy all your BA throughout the course of a NCB, factoring in battle reward gains?

up to 700k a day or more
I'd venture a wild guess of more than 50 mil

Depends on how much regenerated BA you are spending and how high you plan to get the character. It also depends on the time of day you buy your BA, as it will be more expensive later in the day. I'd guess closer to 37-40m if ya never miss any...

are you subtracting the money you get for battle rewards you'll accumulate the entire time? 40 to 50 mil seems awfully excessive

Approx 20-25mil must be spent ontop of all money earned from battles.

I simply took the 700k a day someone mentioned recently, subtracted the 200k a day I think are close to average rewards and extrapolated a number...

Nerevas however has actually spent the cash, maybe more than once, he's the one to listen to.

hmm... I heard it was in the upper 20's before the N*B buff. I figured it'd be much higher now...

I would venture to guess more in the range of 30 to 35 mil on top of money rewards.