I don't think a reward is necessary, however I'm sure more people call knowing it benefits them in some way whereas if it didn't they wouldn't call. We live in a selfish world so there needs to be incentive for people. True lovers of the rivers and lovers of the sport have different motives, maintaining the wonderful rivers and the fisheries. Either way the call gets made no matter what motive and hey, if some need the motive of a reward, great, at least the calls get made.
As it has already mentioned, I agree, we are the eyes and ears for the COs. They can't be everywhere all the time and since they have a ton to do other than watch the Bow river if we don't speak out there will never be added resources. If we keep calling it in, even if there is no response, an argument can be made for more enforcement and funding, etc. With no call the other argument can be made and cuts in enforement and funding could result. Keep calling guys no matter the outcome. It'll all pay off in the end.
Oh yeah and don't forget to punch the poachers in the back of the head! They don't see it coming and you can run away before they realize what the heck is happening. LOL!