Why isn't the MSQ roulette EXP consistent?

[YukikoKurosawa]

You may complete certain challenge log entries that give a some Exp.

What exactly does this have to do with anything? I know that, but I'm not talking about that. That's not the issue, the issue is Praetorium in the MSQ roulette gives me a very different amount of exp each for no apparent reason, regardless of level range, or if my role was needed.

I'm at the point where I'm not even going to bother with it ever again, it's a waste of time if it's not a full level or at least just about.