I made the mistake of leaving coins at Cryptsy years ago only to come back recently and find them shut down. 
Very sad to lost bitcoin, but sometimes it will gives us more learning to be careful into the next thing we do in our bitcoin, i think now you will be more extra careful on the site that you invest.mistakes would make us learn in our journey with bitcoin and for sure we wont make the same mistake again since we are already aware of it. We do lack of knowledge thats why we commit mistakes which is normal for me and i treat it as a stepping stone to my success because i assume that no one didnt commit a mistake in the beggining.