> Keep track of all your development and protection costs to help you put a value on your IP
No. McDonalds doesn't price its cheeseburger based on how much it costs but on how much a consumer would be willing to spend on it. That's a huge difference. How much you've worked and spent is meaningless in terms of the end value. The only question is how much would others value it.
And second, it doesn't clarify enough that inventors almost never make money on their inventions. The person who brings it to market makes all the money. Are Bill Gates and Steve Jobs inventors? Exactly.