We'll probably sell single units as well. It's not a promise though. I believe that a much better model for a small buyers will be to buy some small percentage of a shared mine.
I believe that centralized model is not only bad for Bitcoin, but goes against the basic principles as well. It's disturbing enough that manufacturers are competing directly with their own customers by mining, but excluding the home miner all together is an absolutely horrifying thought. It would be really respectable if you had the exact opposite thought of, "we will ship all orders of 1 single miner before any multiple miner orders, including bulk purchases from hosting partners." I know you're running a business to make the most money possible, but there is something to be said for companies/people who put the community first.
I full heartedly agree with your two opening statements. Unfortunately, I don't see how can we survive by implementing your suggestion.