The startup world may be influenced a lot by Mark Zuckerberg's motto of "Move fast; break things."
However, I don't think it's a good goal to aim for.
Like @andreasklinger and @hashkb said, you should have agreement with your engineers about your limit.
Refactoring can never be enough, because we always try to improve, try to be better.
You can think about the "later days" when you can come back on your codes and fix those crap codes, but you know you won't. The bigger the debt for now, the costlier it will be in the future.