Thing with steam accounts is that they're so easily recallable. A single message to steam support and they'd give you a way to change your password. That's why steam accounts aren't valid as collateral. Let alone that the value you quoted isn't easily to liquidate in any way. So even if you had a way to convince that you wouldn't recall your collateral back (no such way exists, I'm talking hypothetically here) in the case that you defaulted, the person that gave you the loan would have had an extremely hard time trying to sell this account to gain back what he lost from you defaulting.
I've modified my collateral post to list Steam as an example of social engineering. Hopefully this will cut down on users trying to use it as collateral.
- Most valuable online accounts can easily be recovered by social engineering (the user contacting support to say they were hacked, and regain control of the account) Examples: Steam
