I very much doubt anyone here will want to use this program. If you are already in there is no good reason to.
Also, (since I haven’t signed up I can’t be 100% sure), this is not targeted to keywords like Overture is. It’s targeted to your page showing in the results. This means if someone searches for: live roller rooms a page like casinowebmaster’s might show in the results and get clicked, costing 15 or 30 cents.
So anyone who comes to your site via search terms that aren’t useful at all to you but you happen to rank well for will still cost you money.
This program is for big retailers to get their deep product pages into the Yahoo index. yahoo is promising to improve its free crawl of the web, which is not very good now. If they do, then there is no reason to even think about this for most people.