An idea can costs millions if you got the right people in front of you.
Now that you've shared it to us, it is not secret anymore lol. You could have keep that to yourself and share the story on how did you able to do it.
You can sell 1m pieces of your product at $1 each to get a million but how long that would take? a year? 2 years? 5 years? It is easy to think of the way to get rich but it's difficult to do and you should realized how unfair the world is. You could have a single product, proposal, or any idea that would convince Bill Gates to buy it and that's how he started his company. I didn't think the richest man in the world followed your 'secret formula'

Anyone can make a secret formula on how to become a millionaire and its easy to calculate but the process is hard and will surely take years or even decade to be realized. If you are selling a product, you should sell the best product ever so that all your consumers will be totally interested to buy it.