I Believe You Can, But The VCC Has To Have A Balance Of At Least 5 Dollars, Because That's What Google Charges To Activate The Account.

The Reason Everyone Is Using The Voucher System Is Because You Can Activate The Account Using A Throw Away VCC With Little To No Balance, And The Voucher Will Cover Your Activation And Advertising Cost So You'll Be Able To Use Ad*words And Owe Go*ogle Nothing.

I Hope This Helps