As the saying goes ...buy nice or buy twice
There are some extra items here that are appealing to casual players. For those who are only saying they'll purchase the low levels ... Don't fall into the trap of doing that and then seeing the nice new stuff that you wish you had and subsequently re-up your ante. It's a classic marketing technique.
Get it all up front.
As a side note, if you want the Elieri level 3 hireling heals ... She is on sale on the website for $9.99 along with some other stuff.