Correct me guys if I'm wrong, but they way I see it the increase in difficulty is the key in pricing something like this and assuming a 10% increase in difficulty per week (which seems fairly accurate at the moment) a batch 2 avalon worth somewhere around 160-180 btc depending power cost, uptime, pool fee, etc.
It's worth what someone is willing to pay for it. Many people thought 20k was a high price for a batch 1 Avalon 2 months ago. If I knew then what I know now, I would have bought a few. There are a few companies saying they are about to put a lot of hashing power on the network. The fact is, no one knows what future difficulty and bitcoin prices will be.
One of the biggest mistakes I made was selling all of my GPUs in October 2012 to prepare for a huge difficulty increase from ASICs. ASICs ended up being further out than expected and BTC value skyrocketed. What may seem predictable now is truly unpredictable, and those who risk the most, make the most(and lose the most).