Ok so after debating it for a while, I just paid the $299(U.S.) to have my website added to the Yahoo directory. Stinks you have to pay so much to get added, but it seemed like a good business decision.
It can't hurt Opportune Moment, it can only help. The only times I don't think it's worth it, is if you don't have the budget, or if you handle too many sites - then you should only submit a couple. Let us know how it works for you.