Online secondary ticket resellers are back in the spotlight after the state government issued an urgent public warning about "unfair and unsatisfactory" sale tactics.

Minister for Better Regulation Matt Kean announced the warning on Sunday, targeting online ticket reseller Viagogo, which has been among the top five most complained about businesses for five months of the past year.

Fans of Adele have previously lost out to automated ticket scalpers that snag tickets en masse, to sell at inflated prices. Credit:AP

"Complaints to date have included delayed delivery, events being cancelled, heavily marked-up prices, hidden fees, and failure to provide refunds," Mr Kean said.

He estimated around 600 consumers had lost almost $130,000.