I suppose people know how successful these have been in the past, so the core pledge will be much bigger than it starts with.
I bought Bones 3 (IIRC) but went in pretty late on when most stuff was unlocked. It was a huge amount of figures, and took an age to deliver. Ultimately it was far too many disparate figures - some of come in useful subsequently - but most are still unpainted. The big stuff, giants, dragons, ogres are great value for big imposing figures.