To be honest, I'm just looking forward to enjoying the event in whatever form it takes. I missed the last Halloween event entirely because I timed a holiday badly, so it'll be fun to get back in the action.
With that said, here's my thoughts on your points, which are generally positive
These are always drops in gg caves, even if you don't get one yourself or are even doing gg caves, the player to player sale value of teles generally drops during events so it's a good time to buy one
Compared to previous events? Or just in general? I think the recent events were quite nicely balanced. Rare drops are nice, but If 'rare' drops are TOO common then it really takes the joy out of it. Finally getting something you've wanted for ages then find out everyone else in the game has 3 of them, kinda ruins the shine of the moment
I think it would be good to make these purchasable with demon souls, as a reward for active players
Disagree with this one, loads of people advocated for that before, it seemed like a good idea, then GM finally did it last time around and everyone hated it. Guess you can't win whatever way you go on this one lol
A dream I've had for a long time, can't see it ever happening
Some kind of competition yes, but doing the same again is fairly likely to have the same winners. I'd say mix it up and find another metric to compete on
Yes but keep them rare! They were never meant to be in the game to start with, got added temporarily for a specific reason and everyone started to rely on them and think of them as a normal thing. I think they are generally a bad idea, they are beneficial for the player using it in the short term but very bad for the server in the long term