I don't really know how the yahoo's algorithm. It's sure it is different to google because the result of Yahoo and Google searching engine are different. We can find the reading of Google SE algorithm on the net, but it is difficult for Yahoo.
I'm pretty sure he was talking about submitting your website in general. If so, I still can't find the link to add my URL to Yahoo. yugo,
Well, even i do get visitors - and you should have minimum of 500-1000 backlinks from Yahoo to get decent traffic! If you can afford to pay $299 per annum to get a Yahoo DIR listing, then you can get a lot of traffic - but be sure that you can make more than $500 per annum with that traffic, otherwise there's no point in wasting $300!!
i think more and more people like use google,if you want to have a good rank on yahoo, you should do more external seo.