Hmmm. Obviously I meant that it isn't ALWAYS realistic to think that you're going to find a home for your dog by the end of the day. Should have been more specific. From what I've seen, finding homes for the "happy" cute dogs is typically eaasier too (and small dogs seem to be going most, at least around here), as opposed to the paniced posters with a bully breed or giant mixed something, or something that more than likely has problems. Just the other day there was a post from a girl going on about how her "8 week old solid white mini dachshund puppy that i just got" had to go - to anyone, no specification on if it went to a good home or not - by the end of the day. I would have put money on her just having found out it had a health problem.
That said, it's great you were able to snag some right then, I'm just saying, this certainly isn't always the case and many times the poster seems a lot more concerned about getting the animal out of their way, then making sure it goes somewhere safe.
I don't have a problem with a reasonable re-home fee IF it covered vet care and they can give you the vet records, but I wouldn't pay more than $100 for a craigslist dog myself. Maybe $150 if it was already altered and really what I was looking for. As someone pointed out, a lot of rescues charge these fees, which I feel are reasonable.
I DO have an issue with people who are frantically trying to foist their dog off on the first person possible to get it out of their way - AND recoup their money on a dog that has problems (behavioral or medical).