At least, obviously the player order is randomized once you start playing the raid. So, if you have a 0 damage registration phase, you can already conclude from your 0 damage rank where you will end up in the final solo ranking (depending on how many active solo players are placed before you), and thus you can decide whether it's worth the "effort" (of 5-30 mins auto-run xD).
The alternative would probably be to have the same but worse rewards for everyone... I didn't find the randomization biased so far, so I'm okay with it.