The 'cheaper' thing is used quite alot. But if money is the argument why not make them a little bit cheaper to get more people to go now? Decide on a good balance so the gain in volume will outweigh the drop in individual prices. To get a large number of new audience members who dont go because of prices (alot more than the smaller number of pirates) there must be an incentive. You dont tell them "pay full price now and maybe we will lower prices later'. Thats a very bad way to try and expand a market.
Besides, if piracy was cut in half how many people think there would be a significant drop in prices? I certainly dont trust them to do it.