I don't think the long range ones are excessive, the exploration ones I mean. Haven't really done enough of the short range ones to have an opinion, I don't even look at them on the mission board usually.
I banked 7 million from three wartime planetary data scan missions tonight, on the board at Van Royen in HIP 10716 and were to scan the next moon over which is about 5 LS away. Took about 10 minutes. *shrugs*
Edit: To answer the question though which was 'do we think they will' not 'do we think they should' I'd say yes but not drastically.
Yeah, I have a favorite system (which I won't reveal) where nearly all the factions LOVE to give out these scan missions. I usually have five or 6 stacked (for various factions) at a time for 1.1 to 2 million credits a piece. Easy money and a good way to get certain types of data for Engineering (Adaptive Encryptors > G5 Fast KWS/DPS).
And several systems near that one constantly have factions that fight it out - often giving me 19 mil, 12 mil, 8 mil, and 3 mil to go kill their enemies. All the same enemies, so I'm completing them all at once. Usually, I only take these if I'm also trying to get the faction rep up. I just don't need the money and the hours of combat can get tedious (though Elite SLF pilots can help speed it up).
I think the pay on passenger missions are fine - both the short range VIP tours (which seem to be in the 2-7 million credit range) - and the long range tours. I do want to do these, and have both a Dolphin and Orca set up for it, but I just never get around to it.
I should point out that in all cases, the big $$$ is attached to higher rank missions. Personally, I think the rates are all fine. And if people want to go do that stuff at Quince (is that the right place?) or do Sothis/Ceos runs for big cash payouts, that's fine too.