I'm selling a 12 BTC coinbase account for only 2 BTC.
Contact me ASAP if you are interested.
Escrow accepted.

Then why don't you just withdraw the 12 btc if they can be withdrawn? scammer.
Don't fall for it guys.

I bought those 12 bitcoins when the price for one Bitcoin was only $2. And now I want to sell it for 2 bitcoins and make a profit out of it.

Why not sell it for 12 btc and make even more profit out of it?
You said you bought I when btc price was at 2$, so tell me when you bought it

the reason still does not make sense to me. if the 2 btc you can get profit, might as well sell the 12btc to get the max profit.