It's a really tough thing to gauge, when to stop. It seems that a lot of a startups success isn't necessarily all about the product (although it certainly helps

It's a really tough thing to gauge, when to stop. It seems that a lot of a startups success isn't necessarily all about the product (although it certainly helps, a lot), but the timing. Perhaps your startup is ahead of it's time? Fundamentally, when to stop depends entirely on the depth of your wallet and the level of your determination.