I think the idea of having a reserve is so that way they don't have to sell it for less than they feel its worth. Personally, I wish they would just set the starting bid price at what they would "accept" for the item. At the same time though, in a bidding situation like this, the market gets to decide the price. Certainly a nice working Lisa 1 system is worth $$$$$, but there is a better way to set a "minimum price".
I'm not exactly opposed to reserves, as I do think that you shouldn't be forced to sell something for lower than you (reasonably) want to get for it. You can cancel the transaction later as the seller, but that is just poor form. If you know what an item is worth, and the market is in a place where there are people who will buy it at the price, don't set a reserve, set a minimum bid instead.
I do wonder how many people put out 'feeler' auctions- where they list everything as if it were a real auction, but since reserve price is private, they set it ridiculously high (to the point where no one in their right mind would be able to buy it), and see what the maximum bid was, or "this is what someone was willing to pay for it".
eBay is certainly a weird place sometimes.