On a serious note, the level 50+ pool is open to everyone. It's quite bad for fresh level 50 players who can get raided by everyone, but remember also that you have access to bigger rituals to raid compared to the lower levels.
The thrones unfortunately were changed in a recent update, now they are a slightly better than before but they also cost a lot more. I suggest you to use this event to rack up some purple dust, the recipe offered by Shady Joe is pretty cheap and it gives you 3 dust. And for the rest... always run rituals with crap gems to gather ingredients, and always upgrade your traps if you can.