Essence of Purple.
How Tiny Speck, "isn't about the money". Actual quote from their Unlaunch thread.
Customization.
Free.
Splanking.
Poking old cheese to obtain shiny rocks.
Also, the community.
Helpful, and kind.
Oh, and the staff. Given I can IM them while in-game, and I always get a instant reply.
Global chat and the many wonderful people I've met as a result.
The spectacular art work.
The clever humor
some cool music clips
rookswort (I could use a few thousand of those irl!)
Piggies, Piglets and chicks. food for the affection starved.
The overall premise -- we are all just figments of giants' imaginations so anything is possible, the game is not constrained by having to bear any resemblance to reality
Freedom - this is not a linear theme park MMO
Piggy nibbling, chick raising, talking trees, earth piles, seafaring barnacles, purple potion (!)
The snowy landscape in Aranna backyards
Clever humor
Housing on real streets you can walk and interact with your neighbors (not instanced as in some games)
Freedom to learn any and all skills - totally my choice as to how I play the game
Fun and varied artwork - Groddle, Ix, Salatu, etc.
Great community (someone placed some flowers and a drink on my doorstep when I moved into my new house)
Staff who actually care about and play the game
Token purchases are for fluff, not for in-game advantages
No small children playing (I love kids, but I when I relax into a game after work I want to interact with adults)