I have no personal experience with Ask's PFI program but somehow I think that given the relatively small amount of traffice that Jeeves seems to produce these days compared to Yahoo or Google the number of people who were participating in their Site Submit. When Jeeves doesn't even crack 1% some months in my logs I don't think that their program had much added value.
It seems like most attempt at PFIs are always having trouble finding a happy medium where webmasters are convinced that it is worth paying for the improved ranking but where the end users don't flee because the first page is dominated with advertising.
I don't know about the webmaster but Jeeves is probably better off without PFI. Hopefully they will try to improve their organic results enough to make up for any lost revenues through other means of advertising.
Also depends on your placement with them too though. But, yea, even with top placement, they are no wear near the other three - I have a few sites that do very well in AJ, but we're still talking less than 5%. But, if they keep up the momentum they've had lately, those numbers may continue to rise.