You'd make a lot of money with this, I think. A lot of people don't have financial advisors and also don't have any method (or knowledge) of how to model various scenarios; if you built this out I bet you'd have a nice little passive income tool. Would it make billions of dollars? Probably not.
I'd use it and pay for it though, especially if it factored in historic market data, automatically figured out housing increase rates for my area, etc.
Could you see yourself using something like this if there was an easy way to compare different scenarios?
[1] https://lunchmodel.com/lmrc/scenario