QR
RWZ hunts used to be 10 per mission, but then people started actually using them to exp so they got nerfed. Since this would make all hunts like that I sadly doubt this will be implemented.
I don't think any hunting mission should require more than 20 mobs.
The City of Heroes Community is a special one and I will always look fondly on my times arguing, discussing and playing with you all. Thanks and thanks to the developers for a special experience.
Ya, 30 Family/Longbow or whatever for a costume slot is lame.
20 tops or how about none?
The funniest part is that carnies are easy to find in PI, when you're not looking for them. 
One way to deal with difficult-to-find mobs might be to cause the player with the hunt mission to spawn them. If memory serves, outdoor mobs are spawned by the presence of a player in the general vicinity. If there is a spawn point where groups X, Y and Z can spawn, and the spawn is triggered by a player with an active "Defeat # Y" mission, the spawn will invariably consist of/contain mobs of group Y.
Hi:
Instead of having hunts being a fixed number, such as hunt 65 Carnies in PI (even though they may be a grand total of 8 in the entire island at that time).
Why not make the hunt be scaled to the number of players in the team, that is make it 10 mobs to a player. So if you are soloing, you get hunts that do not exceed 10, if you are in a full team of 8, the hunt would be for 80 mobs.
Perhaps a more player friendly, is instead of the number of mobs you have to mug to get the information needed, and being fixed so it "happens" that the very last one happens to know, why not make it a random occurrance, with guaranteed success if the whole ten of them (if solo) were defeated. So this way, you may get lucky and the very first one you beat up, spills the beans, or you could be unlucky like me and it will be the very last one of the bunch who tells you. But it would be nice, that we would not have to be perfectly unlucky all the time.
Hugs
Stormy
Ps: If there is going to be hunts in PI for carnies, malta, nemesis. It would be polite to have fixed zones with these, as opposed to shared zones, where you find yourself having to kill droves of Malta to get the eventual Carnie spawn, maybe after you wasted tons of Ricti, and Nemesis too. Frankly I don't find hunts challenging, I find them "annoying" and having to kill stupidly to maybe, just maybe, what I need gets spawned, is just frankly indecent.