Damn, that is crazy. Its actually [At least, looks to me] every 5 to ?? seconds. [Originally saw max of 20, now 51. Hmm]
Ive only watched it for a short while, but it looks like an average is right around 10 seconds.
Now, as interesting as it is to consider its a bot trying to get top dollar for the asks.. wouldnt it really just make more sense to market sell into the 140 wall? Yes, yes, 66 cents less.. but.. no risk. And, chance of triggering more sells -> lower buy back price.
What if the "1 BTC Seller" is the same person as the 2400 BTC wall at 140? Wants to sell a bunch of BTC to load up for the next push without losing too much ground on the last push. I am thinking up from here once he has sold it all or he runs out of buyers above 140.