With my interpretation of the art, the answer is "sometimes". The primary goal and strategy of Ninpo is survival, and if that means escape, escape. If it means taking them out quickly, then that is what I do. One of the primary tactics used to survive an unknown encounter, though, is to take your opponent out of their area of speciality, so if I find myself up against someone who is clearly a highly skilled and competant boxer or kicker, and I can't make distance to get away, I may very well move in and take them to ground, as it is less likely that they will have experience there. But once in more of a position of control, escape is the key. So if I take someone down, it is rarely to submit on the ground. It is to quickly take control and finish (to allow an escape) as soon as possible.
I would agree... but add the addition of at our dojo we train assuming he always has friends... so we make going to the ground a bit of a last resort, IF IT IS OUR CHOICE. And then when it is neccessary or happens, the goal is to get up and out, like Chris said, as soon as possible. We try to avoid going down there for pain compliance, restraint or submission, those can take too long and leave you vulnerable to a second guy.