It's also 400 fragments rather than 200 - they're definitely trying to reign in the runaway sac events a little bit, which I think is fair enough to be honest... I don't spend any real money on the game; I just grind my Troopers each day and the odd SoT (mega)refill for events and I still had enough souls saved up since wiping myself out at the last sac event to fill the vortex 3 times (including souls gained during this event). The limiting thing is gold but I didn't go crazy on the last events so had plenty of that left as well.
I think that for my level of play, the reward I got from this event was worth it. I can understand that people who pay money and want to get all characters maxed/sharded/etc. might not feel the same but there are other events aimed at them that require more investment than other players can manage. Nice mid level event for me