I would be cautious about buying steam accounts. I heard that there is way to claim ownership of account even after some time and without access to it. It means basically that this account can be returned to its owner even after being sold and claimed by another person.
Sh*t, I did not know that. That combined with an already low trust standard here makes it pretty impossible to sell any steam accounts (I noticed a few threads blatanly selling high-tier accounts for this forum).
Thanks for bringing it up.