I strongly disagree with the first answer - of course you are building to sell! They key is how fast and what is the multiplication factor for investors...

But back to the question itself, I think the most important thing to remember about investors and fundraising is that you are not just getting money - you are selling your company piece by piece. So at each round you need to be sure that what you get is worth what you give away. Simple math might show that at the end it will not worth much for the founders.
The rest are details of strategy and specific business and need to be discussed directly. Happy to talk.