Jagex has announced that there wont be rares in OSRS, phats, h masks and easter eggs will all be handed out during different events every year. So no they aren't going to be worth anywhere near what they used to be.
J mods select certain individuals during the holidays and give them pumpkin spawners h ween mask etc. I ran a few events due to this and dropped rares.
It's a shame Jagex decided to do that for osrs. I feel like rares were a nice part of the game, a huge goal for people to work towards. They should have polled it tbh