Maybe the guy meant to double within a short period especially if he earned that $99 for months or maybe more. My father's advice was usually to bet your money on a gambling game that it can be doubled.... or nothing. Doubling the money is an ancient issue that the only probably means is gambling.The same way you made $99 is the same way you will likely work to improve of double it. You can look for other means of making money that will not affect the current one you are doing.