I will throw my thoughts into the wind if anyone's bored enough to read it, hopefully just constructive feedback.
I have no strong opinion on written RP as a requirement - if the rewards are good enough to warrant the effort, I will make a small post to claim it. The crux of the matter is though, to my mind, it will never really be something that is organic, and will always be a "throwaway". The only situation where that wouldn't happen is someone is actually interested in the ID or character prior to the event.
In my case, I really like Gallic Brigands, and had a small faction i was once in - so I was motivated to put in a lot of effort into roleplay. This wasn't to get any rewards, my goal here was trying to put in the effort and get the faction some recognition or activity in the canon space, as well as fly in a House I am actively looking for reasons to fly in. OS&C is the only other one here, and they've been recognised for doing a lot with the event. The other listed IDs are dead in the water.
I think St. Denis raises a good point - if you want quality RP as an outcome, those feeling motivated to RP will find it without any reward on the line. @"Perfect Gentleman" (kudos) is an example, and we've had in-depth roleplay both in-game and on forums and it all spurred from one random interaction while flying and shipping cargo. His character isn't even participating in the event and not one of the listed IDs, but is definitely worth recognition.
Reward wise, I applaud the potential reward of canonising or putting contributions into canon. I think that's a lot more interesting and valuable than credits which are easier printed elsewhere. Getting custom cosmetics (contrails, engines) is also very cool.