I have never submitted to msn or inktomi. i am listed about 15 for my most competitive keyphrase. great! what should i do to get to number one? if i actually paid and submitted, would my results be higher? why am i there at all?
MSN gets its feeds from Ink, Looksmart, and Overture. So a listing in Overture or in Looksmart (including their Zeal directory) could get you into MSN. Also, Ink charges to crawl your site often, but they may have just found your site on their own during a crawl. Paying Ink is not likely to change your rank, just increase the frequency that they update your listing.
Some time this past summer (around August, as I recall) Ink made a major strategic change: they started spidering most of the web for free, just like Google does. Ever since I have been getting about 10% of my SE referrals from MSN, up from 0%.
I do not know how frequently they spider for free, those who pay get spidered every 48 hours.
I can't speak to paid inclusion as I've never used that process. But over the last 11 months Inktomi keeps finding more and more of the little NFP info site I operate and the frequency of return visits, including visits to the deepest pockets of the site, seems to increase every month.
I've noticed Inktomi repeatedly locating new pages on the site within 24-36 hours, when only one or two internal links to the page even exist.