don't even share you account no or bank details with them.
Even if the amount is transferred beware it might be using fraud/hacked accounts/Credit Cards.
When you hear the words "Ship to Nigeria" just cut off the conversation and don't even think about it.
The scam is known as Nigerian Letter Scam.
Use appropriate buyer blocks. http://pages.ebay.in/help/sell/buyer-requirements.html
TechiE