Personally, I think this would drastically reduce active membership. If
active members is the goal, which I would assume leads to registered users becoming paying members, I would think this would keep a lot of folks from registering. Although as a positive, it might reduce trolling and summertime tomfoolery of kids when school is out.
Currently there is 18,769 Active members, I don't know the parameter set for what is considered active, but I understand the default is 30 days. It's been on the rise the last couple of months.
Spam is getting bad and I try to report it when I find it, I've gotten in the habit of every once in a while scanning "new posts" for odd thread titles. I know, get a life right?

. But I understand why a fix is needed.
I am no computer guy, but isn't there another way to foil Spammers without asking people to make a payment? One dollar isn't much, but the point alone would have steered me to other places when I first found the site.
Now, if
active members isn't the goal, and the well being of the site comes from views alone, be they "guest", or "platinum", then I would say the one dollar initial fee would be a fair option.
Just thought I'd throw my two cents out there. It's easy to say, "Of course I'd pay a dollar to be a part of this site" because we're already a part of it. This might push folks to other free sites, I don't know.
Nor do I Instatweet or Facespace, but I understand a lot of the knife community is there, and it's free as far as I know.
Like I said, my two cents, that and about six bucks might get you a cup of coffee!