Do you know how they were able to access your wallet? You were lucky to only lose $200, but I'd now be paranoid about your entire computer and things like undetectable keyloggers, trojans, or other things on your network. Secure your system...
There is actually no other way to access someone's wallet unless the owner ignorantly ended up leaving it vulnerable and in that case, it can make it a lot easy for anyone to gain entrance into the wallet. I think so many people usually end up being a victim of a phishing attack, or probably, ended up being a victim of malware and all these is the reason why people should always try as much as possible to stay secured, so they do not end up being a victim.
It's probably you are very poor, and he decided to leave you at least some kind of kapeck, that you would not be so upset. Kind hacker.
I have never really seen any kind hacker unless it is just some hacker who really wants to just play with you or have fun with your emotions after already stealing chunk away from you. Moreover, the wallet actually becomes vulnerable as long as the hacker already have an access to it, so the best way is to simply abandon the wallet and go open a new one to start making use of. I wonder why someone would steal $80 out of $200 when he could have the chance to steal everything. Something sounds vague to me here though.