Honestly if you have a predictive data set, most likely it is more profitable to use it to invest yourself than it is to sell it. Its like a successful startup raising VC funding, the good ones dont need the investors, the bad ones do. Source is I used to work in this space. Clearly there are operational difficulties to investing and serious domain knowledge but if you have data with alpha, its worth insane amounts o…
I'd ask: "If this data is truly useful in a financial market context, why are you selling it instead investing with it yourself? What data are you collecting that you're not* selling?"