Sorry to resurrect such an old thread, but I must have missed it first time around. I've also watched that particular pair of Soundlabs for quite a while (they're still listed, but now down to $1700), and wanted to point out some info about this particular model.
The A2, and A2x, are unique in the Soundlab line. Unlike all the other Soundlab full range ESLs, they were 2 ways, with a curved mid/tweeter section & flat ESL bass section. In affect, they are like Dynastats (same mid/tweeter panel), but with ESL bass panels instead of the cones used for the hybrid. I've heard the A2x, and still kick myself for passing up a pair years ago, but they are not generally considered one of Soundlab's more popular models. They are not an easy speaker to get working well in most rooms... I suspect they may not have had the crossover quite right, so the bass can sometimes seem a little detached from the upper range. Never the less, I think they have a lot of potential, hence my notice of the ones on ebay.
As for value, I think you're right. I've never seen any actually sell used for more than a grand (though they did list for over $3k new), and the pair I passed up sold for $600, and they were the later A2x with an improved PS/crossover. I'm not sure if the pair on ebay is an A2, or A2x, as they don't show the boxes close up.
Hope this info is useful, if a bit late.