you're an idiot bro,
YOU'RE TRADING AN STEAM ACCOUNT.
which is AGAINST the subscriber agreement
http://store.steampowered.com/subscriber_agreement/
read the Restrictions part.
and for proof of you trying to scam.
You're gonna "tell" that account's info to someone,
no one here actually trusts a silly random with stuff like that
He is allowed to attempt to sell it here as long as he is not a known scammer. Being against the subscriber agreement is not against the law.
It is up to the buyer to decide if the risk is worth the price. Buyers should know that account emails and passwords may be reset with a call to Valve support.