If you can create 45 for $2 a box, you should sell it for $10! That's one hell of a margin. $8 profit instead of shooting 7 boxes a day is 20 grand a year net. Well, packaging, shipping, etc would eat into that but you could use your shooting time to make even more instead. Not bad for a side job.
Yeah...because dealing with the BATF as a manufacturer is so much fun. That certainly would take the reason for doing it and make it into work.