Over on Ignition they have added this method to certain players for a deposit/withdrawal where for example you can withdrawal $50 and receive a voucher code that you can give a friend to deposit into there account.

https://www.ignitioncasino.eu/vouchers

Not sure if Bovada will go this route too it's kind of a P2P transfer thing except that it's not instant (24 to 48 hours it says)