Billionaire Len Ainsworth will cash in a $500 million pokies windfall after minority shareholders in Ainsworth Game Technology voted in favour of Austrian company Novomatic's offer to buy out the gaming magnate's 53 per cent stake.

The vote at Monday's extraordinary general meeting ends an acrimonious battle between Mr Ainsworth's desire of only wanting to sell his majority stake to Novomatic, which irked some smaller shareholders which wanted to see the same $2.75 a share offer expanded to all investors.