You pay 50% deposit. You don't get that back if you cancel in under a month. You never sell presales to techno gigs until a few days out. You have to also book +pay for the flights in advance, so you loose out on anything if you're getting a cheap deal. You can only hold bookings far off, and if you can't cough up the fee then you loose to someone who can. Also if you pay in advance, you're probably paying top dollar, the only way we can afford techo jocks in NZ is through personal contacts, or if you wait till the last second and a gig becomes available and they ask for less, which means no promo time... double edged sword!
The main thing is, why should anyone bother with internationals when they're putting 6-10k on the line, when people don't even go to local gigs when they're getting value for money? Can't have the pie and eat it too unfortunatly...
You can actually make money from techno, just like house, or d&b, but it needs the grass roots support, like the other styles enjoy. They have an already established fan base, who will go out and support the locals rain or shine, and then get the treats

I can't complin, at least the house fan base has got out Carter for me
billgates...
Sure, sometimes more depending on the time of the touring year (20 available dates this morning, nothing suitable tho).