Well, if you put the time and effort, you can be the first whatever job you choose, so I don't think it's so unfair. It's not like we'll give the person a MVP card or anything like that either, we'll just give a nice reward because that person will be the first (probably do 3 rewards like the last time for 1st 2nd and 3rd).
You can win rewards by participating in events too, so maybe some class get an advantage for this little contest, but not for all events we hold.
Your idea is not bad either, maybe we'll do a per class kinda reward. Nobody is close yet anyway, so yeah.. let's not argue on something that does not exist!