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Yahoo still carries a lot of weight and brings in a fair amount of traffic.
This really depends on the size of the category in the directory you are submitting to.
A new site of ours was submitted to a category with only 12 listings in their and already this has produced over 100 hits for us since yesterday and cost £450 (fetish wear site)
Your best bet is to submit your site to a regional yahoo and pay only once, because you will automatically be included in the main index and this is a lot cheaper.
Bek.
This really depends on the category.
I have a site about Buddhism that produces about 100 hits a day from Yahoo. From these 100 hits, about 70 are from the directory listing (they find the site through the category page).
At the same time, I have other sites that have gotten 0 hits from Yahoo.
Others get about 10 hits a day.
So it really depends on many things: your URL, what category you are submitting to, whether it is returned in the SERP's as the category listing, how many other sites in that category, etc.
Hope this helps.