UOGuide and Pinco base the numbers off the fish bait count, which the devs stated was the point value divided by two (capped at 100) - but not after a lot of people took the fish bait count method as gospel. In fact, there was a thread early on where people kept talking 0.5/1.0/1.5, and the devs didn't have a clue what the hell the people were talking about, saying that the system was totally based on whole numbers (and I had to explain it to Mark in a PM so he could figure out what was meant).
The problem is, of course, that bait count method breaks down at over 100, since the baits are capped at 100, and only serves to confuse those that don't know about the cap. Treating the bait reward as a derived value of the Dev numbers, instead of being a 1-to-1 correlation to the quest value, reduces the opportunity for confusion.
To make a BOD analogy, I could rewrite the BOD reward numbers, using the square root of the fame each BOD gives, and have a system that would work for most BODs, but those numbers still wouldn't be the ones in the actual software for the reward calculations, just a related number derived from the same number that the rewards are calculated from.