[beat]

As others have pointed out, blogging is absolutely essential to a product like this. Free content for conversion is also really valuable.

Don't be too wedded to your initial revenue model. There are lots of ways you can make money here - subscription, ads, etc. The middle-class investment industry relies heavily on getting a finger on the pulse of the cash flow for ordinary people. If you're deliberately avoiding touching that pulse, and deliberately avoiding remarketing to investment businesses, you may have a hard time getting reasonable return for your work from subscriptions or whatever.

You might want to look into investment clubs and how they work, not as a market but rather as an insight into your customers.