Charon Freighter: 816,000,000 ISK
Drake 3 run 40 material efficiency 10 production efficiency blueprint: 1,500,000 ISK
Minerals to manufacture 3 Drakes: 83,000,000 ISK
Manufacture time: 8 hours
Market price of 1 Drake: 30,000,000 ISK
Manufacture profit after taxes: 5,200,000 ISK
Market turn around time: 16 hours
ISK making velocity: ~5,000,000 ISK/day
By the time those Drakes were out of the oven, I've come to the conclusion that manufacturing of commodity goods is a lousy way of making ISK (L4 missioning makes you 20,000,000 ISK per HOUR) UNLESS you capture the whole process vertically from blueprint research to marketing and sells. The blueprints costs 30% of my bottom line.
Goal right now is to procure a high material efficiency original blueprint of something that takes considerable risk to build. I am thinking of a freighter maybe? A specialized good that has low volume, which cancels the volatility of prices.