I wouldn't stick with the $1 per ounce as your candles get bigger. Sure its wax & fragrance...but when you pour bigger candles, it takes less time to actually make it versus 200 little pillars. Do you really charge $16 for a 3x4 pillar? I'd think 2.5x the cost of materials is where I'd keep it at to try to get them to buy it. My 36" candle is just around $100. Something else to consider...reduce your fragrance load on the bottom layers of the candle. I know a candle that big is more of a centerpiece and is never burned all the way down.