Assuming the seller can demonstrate a functioning product and establish a certain degree of credibility, they will have no problems filling orders with only bitcoin payments. If they prefer bitcoin payments, then they prefer bitcoin payments and you're in no way obligated to do business with them. If you would still like to buy their products, there are plenty of ways to convert fiat to BTC. BitPay and/or some sort of an escrow might not be a bad idea, or perhaps someone from the forum with some credibility who lives near their place of business could stop in and get the scoop?
On a more philosophical note, I think what Terrahash and steamboat and others are doing is very important and should be commended. If it wasn't for these projects, small-time miners like many of us would be getting squeezed out of the business even more than we already are.
Hey Terrahash -- will you be getting advance chips and boards to assemble one or more working prototypes prior to taking orders?
Nightingale, whilst I agree with you pointing out the bleeding obvious, in light of recent scams, they would do well to appease their doting potential customer base that want to support them, just by recognised safe means.
I can only assume that *if genuine, they are adverse to fiat currency for the beneficial tax purposes dealing in a non-recognised currency may provide...