So I'm considering placing a banner ad on WF. Although the $100 does get your ad up for 24 hours, you are sharing space with up to 9 other advertisers. In that case, it would seem the 24 hours is being split 10 ways since they rotate ads. Split 10 ways, you only get 2.4 hours of actual exposure.
What are your experiences with the 24-hour ($100) option?