Note: This doesn't concern only Gotwoot registration, but your general policy.
I have been wondering for a longer time how people usually regard registering to net sites and forums. For example here there are multitude of pages in the members list filled with people with zero posts, who don't have the slightest intention of ever posting anything, and many of whom probably never visited this place that many times.
It usually takes me considerable time to just wander around in a forum, sometimes months, before I register and post anything. And I have never registered to any site without immediately posting or doing something else requiring the registeration. Had I registered here right when I began to read gotwoot forums, my join date would be 4 months earlier!