Saving private keys in e-mail drafts should not be "common" for a trustworthy person on this forum. Getting one's e-mail hacked and forum account compromised literally means you can't trust the user to be who they claim to be.
It should not be that common to someone who understands the importance of it, but its acceptable story and people do sometimes store keys in email drafts. And its really an over exaggerated statement to say that the account is just as thrash now.
If you want to do business with legendster, nobody can stop you. His account is not "thrash", you just don't know who is in control of it, or who will hack (or "hack") it when you send money to it.