It is very difficult as there traffic is smaller and they index pages much slower. I do have a post on how to submit your website to Ask.com if you are interested - Submit Your Sitemap to Ask.com
Thier indexing process is similar to other major search engines. They crawl your website but it is indeed very slow.
I agree with you that AskJeeves refers very very small percentage of traffic. Most of the traffic on Explorewww comes from Google and Yahoo. Then why would we worry about advertising on AskJeeves
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