Do some attributes actually spawn less often than others? For example, I've been looking at every item that drops for extra item slots and it seems incredibly rare to me. Is there a loot table with attribute odds published anywhere?

Drops that have any use are extremely rare it seems

Some are known to be very rare... others seem to only seem rare because we want them to drop so badly...

Ones that I know to be rare spawns are:

Magic luck
Extra item slots
Quickdraw

I don’t really have statistics on it, but a muter who is inactive atm... Hayden (now SunnyInPhilidelphia or something like that) used to keep statistics on the spawn rates of different stats and tiers from mutes he did. If you can find one of his old topics there should be some nice stats on them at least in the old version before the recent update.

Interesting, thanks. I'll look around.

I found 4 eis items in my last climb, one was a 7 slot 45

From my experience I'd say Magic Luck is the rarest then EES.

mana consumption is the rarest

Magic luck
Ees

Like bw said. I've tried to put together a lot of glyphs with specific stats and those are pretty darn hard to find.

Mana syphon, lpk,mpk seem to be some of the easiest to find.