Unfortunately, this sort of thing happens a lot in this hobby.
People tend to get attached to their pins, and sometimes do actually get buyers remorse and back out.
People sometimes stick a game on Craigslist or Mr Pinball and end up accepting an offer because they need money, and a better offer comes along. Before you show up with $$ and a truck to seal the deal, they get greedy.
A lot of people stick something on Craigslist, having zero idea of what it's worth. Your 'bargain game' may be the way they are putting food on their table this month, paying their past due mortgage, or God knows what other problem they have.
I value my integrity, and when dealing with me, a deal is a deal.
But, I understand not everyone has the same morals or ideas that I do, and I also understand sh*t happens.
I hope you find an even better deal next time. Don't let one bad deal sour the hobby for you, most of us would've lost a lot of fun if we did!