what actually is a wire transfer as offered by 2co ?

http://www.google.com/search?hl=en&q=What+is+Wire+Transfer

That is fast way to get payment to your bank account ;)

The banks in between will substract some fees but generally this is one of the most legal and safe ways of transfer between trusted parties (such as 2CO and you for e.g.). If you live in a VAT country the clear flow of money will mean less headaches with tax officers as well.