tubezipper does bring up something I was wondering about, Cougar as well. Starting new threads annoys long timers, and well, doesn't help the search when "Cold Steel", "Sebenza", or "Spyderco" pops up in yet another thread. Taking out search kinda makes it hard to want to stick around and eventually pay for membership, which I would say is why Spark himself says it's temporary. Paid forum memberships are the minority on the web, so it's not so easy to expect a large percentage of lurkers and newbies to pay for a year to find out if they like the community and the functionality.
I was gold for close to six years, there's a few personal opinions about things which have postponed my renewal for the last few months.