If you want it for your time capsule, that's cool too. But we all know that ASICMiner is preying on the people who are too stupid to do math.
The price doesn't come down without consumer's investment in purchasing product, by my calculations a distributed network adds value to my BTC, and I think a USB miner in the hands of every person invested in Bitcoin is much safer than all AM chips mining for shareholders.
So I am buying a couple to stimulate demand. The way I see it: it is a hardware dongle that allows your BTC wallet (be your own bank) to accumulate interest by providing transaction services to the network). The distributed network being a foundation design element in the Bitcoin Idea.
I was buying BTC at the end of 2011 (in the $2-ish/BTC range) for the same reason (providing demand), or at least that was a legitimate part of what was driving my actions. Almost everyone was saying it was stupid because they were
1) incapable of visualizing anything but the money aspect of things
2) following the herd mentality which was that Bitcoin was dead.
I see devices such as Block Erupter as being a hugely positive thing for the health of the distributed crypto-currency world in both obvious and more difficult to explain ways.
If there is a demonstrated demand for such devices at 'rip-off' prices, that will encourage more development along these lines and we'll be seeing genuine commodity pricing that much sooner.