If you do the following:
1) Make a product
2) Sell it for a price that will allow people to profit after 30 days (don't do what Avalon and AsicMiner did, which is capitalize of the fear of not owning one)
3) deliver it too some bloggers
4) open you manufacturing facility to be viewable (photos, webcams, etc)
5) have a supply line that can ship a product to a user in < 30 days
6) be ready for a flood orders
then you sir will have a crazy cash machine on your hands. . ..in the end with bitmining, it's the hardware makers that will make "bank"
One question that has never been answered to my satisfaction: if you can manufacture these things to meet the above criteria why would you sell them? Why not mine with them yourself if they are that profitable?