You're going to have to break down the $90 in certs for me, I'm assuming you're considering $45 or so for the game itself, right? $400 in VGC will net you 100 points shy of $10 (well, for me, since I'm elite, not elite + or whatever it's called). And you're also forgetting to include the $12 needed to purchase the VGC, unless you're starting with some certs to seed it.
Ahh, there's also the $10 preorder certs I guess, assuming they post in time.
Well, I found out my local Walmart has a fully functioning money center atm, and was able to load a VCG onto my serve card easily, so in my case I'll pick up 5 $200 certs, pay the fees with some existing certs I have and net $75 for the deal. If the points post by the time the bundle launches I'll do one more round for another $75 using the certs from this go.