I've seen successful finishers. You can see them hang out around sites like www.flippa.com , looking for that special project that they could buy and operate as owners for a quiet life and sustainable revenues.
I think Rob Walling is a perfect example of a Finisher. He's purchased several different web properties, polished them up with a new skin, new marketing and new copy, removed all those nagging little bugs that the previous owner left languishing.