Interestingly, BTS doesn't actually need investors in the traditional sense. The kind of capital infusion you are referring to here will never be required by the system because delegates can be paid a salary through inflation, and because of the completely frictionless and transparent nature of the system, any positive business transaction should theoretically instantly get priced into the market cap. Thus a diluting delegate will always be "funding itself" directly by continously increasing the market cap by more than it takes as payment (on average, if it's profitable), so we should never find ourselves cash starved and in need of capital infusion in the traditional sense.