In deed some people are sharing their public and private key that result in account hacking. I see site that provide service to ensure that the public key and private key is stored securely but I think it would be a negative effect because it might be more susceptible to hacking. However, there are times that people complain that their bitcoins is hacked due to the negligence of the wallet provider or the trading firm. Hackers mostly target those big company rather than a single account. But do you have any suggestion those event wont happen?.