Committing on the spot can happen, but it's the exception, and a small one. I'd be surprised if it accounted for 5% of investments out of DDay. So it's misleading to describe DDay as if that was how things worked.
It was not a tactical choice by Greplin not to raise a large round after DDay. No one would give them one. But your advice for me was not to tell people only to raise small amounts. I often do that. You said I should tell people to quit, which would be a mistake, because I don't know yet which ones I should be telling to quit.