I have been a member of Yapta for 2 weeks and so far have received just 2 e-mails (labeled Yapta Weekly Summary), and the second one had a price $40 higher than the first. If the price goes down, I am supposed to get an e-mail automatically, right, I don't have to wait for a weekly e-mail to arrive?

How does one decide when to buy, is it just a feeling that you are getting a good deal, or will Yapta tell you when it thinks the price is not going to get lower?

Thanks!