Where are you getting your "20-30" buyers numbers from, TMHG?
I doubt the X1000 sold a boatload off the first production run, so they are likely indeed low - just curious who's ass you are pulling numbers out of this time.
To address the OP, in regards to registering interest. I've always stated in no uncertain terms that I felt the prebuilt system idea was a detriment to the X1000 project. I haven't bought a prebuilt PC in like 20 years, in fact I think the last one I bought was likely the PC that replaced my A4000. Many others are in the same boat. Many are hardware jockeys like me that want to build their own machines, people that simply do not buy prebuilts. We like our own case picks. We like our own HD, PSU, RAM, etc. choices and simply won't buy a prebuilt. Ever. Wintel or PPC, or anything in between.
Having a motherboard only option would not only lower the cost (face it, they *are* making a premium on the components - that's only basic business sense), but would have actually got me on the sign up sheet regarding pre-orders if the price on the mobo was acceptable. Can't help but think a lot more people would have been interested if a bare mobo was available like the SAM boards - and yes, system builders are well aware of the risks of them killing boards if they build systems in a stupid fashion.
I was signed up on their email mailing list before it was announced that they would only be coming in prebuilt form. I wouldn't have bought my SAM 440ep is a bare mobo option wasn't available. While I can't say price isn't a factor, I was truly interested in the X1000 when I was going under the assumption I could throw it together with my own components. Sadly them not offering that lost them a customer and a developer, as meager and niche as my coding efforts are (face it, no one is buying OS4 machines to run PPC native telnet BBS software on, lol).