Why don't sites like Last.fm and Facebook have one-click ticket buying options on event pages? Like it recommends you gigs you and your mates might like, and with your card details stored you can just buy tickets with one click of the mouse. It can then recommend you more gigs based on past purchases and suggest friends who might like to go too.

I reckon impulse purchases would go through the roof and as a result it will hugely increase revenue for live music.