can't say I didnt see it coming. Ive been around for awhile and see people who amass a huge collection of stuff in a very short amount of time usually not last too long. It may be hard to accept but in a weird way, most of the fun of this hobby is the anticipation of the piece. Once you get it and set it up and live with it, the excitement fizzles. Sure it looks awesome in your display and you are proud of it, but there is no excitement and the thought of "there is $400 sitting on my shelf in the sunlight" next to countless other multi-hundred dollar pieces can overwhelm your enjoyment of it. Also, where's the fun if you have everything and don't know what more you can buy?
Like bodie said, a steady pace and not falling into the trap of getting things only because "they'll look nice displayed together" is what keeps things interesting.
I think Dave and only a few others who are on the forums actually are still going strong. most of the rest either completely got out or sold off a portion of what they initially had.