Cake for 330 and only 3 tiers....2 that are fake? Not gonna happen. Regardless, I believe most people on here charge the same as they would for real cake less 20%. For example - if the "real cake" would cost $100, you would charge $80 for the dummy tier.
I was about to say "1 layer for 300 people?!?!?". Not possible. You might want to point that out to them.
I know, I was going to tell her it's impossible to feed 330 with one layer, but she did mention they were giving away another cake, as it's a Jamaican wedding, but they wanted something to offer that's just normal, like a vanilla cake. I'm going to see how many people she wants to feed with that first. But, if dummy tiers on top, and say she only wants the bottom to feed 100, wouldn't I just charge for 100 people? I mean, styrofoam isn't much?
But, if dummy tiers on top, and say she only wants the bottom to feed 100, wouldn't I just charge for 100 people? I mean, styrofoam isn't much?
Oh I swear to high heaven, I've got my mom-finger out for you, young lady! 
Styrofoam isn't much? Have you priced it? I ran the numbers. Depending on the size, I'll sometimes spend more on styrofoam (and shipping) than I do on actual cake ingredients!
And it's not the cost of the cake (or in this case the styrofoam). They are not paying for the cake .... they are paying for the time and talent it takes to turn a piece of styrofoam into a sugary work of art. Are you REALLY willing to do all of that decorating work for free? Don't prostitute your talents!
Read this article in my blog. Memorize it. There WILL be a quiz. 
http://cateritsimple.blogspot.com/search/label/fake%20cake
FYI: a 6/8/10/12/14/16 ... that's a 6-tiered cake ... serves about 306. THat's about 17 cake mixes. If you can find a pan that will hold the equivalent of 8 or 9 cake mixes, ... well , I want to see the oven it fits in. 
. I have bookmarked your blog....makes it perfectly clear! I was about to say, have you everdecorated styrofoam. When you do you'll see why people charge 80% (I charge 75%) of an actual cake. Also, are you ok with another cake being there that you didn't make? For me thats a serious quality control issue.
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