Shutting down the site doesn't make sense to me. I would think that an effective blocking program would be sufficient. But I don't know enough about website management to say any more than this.
An effective blocking program takes time, money and know how. Non of which I have much of. Well, I have time, but not that much.
Sitting around a campfire this spring I complained to the others there about how much the organization we all belonged to spends on it's web site yearly. As usual, I had no idea what I was talking about and in time, I would learn some lessons.
There is a reason that all the major paddling sites have advertisements, to help pay the people who know how to keep the site up and running clean. It's a job that requires some real knowledge about web sites, always trying to stay one step ahead of the off shore bandit's, and alot of time learning and adjusting. I would imagine it can be very time consuming.
For those who don't know, I layed out my own money to keep this site running after it was to be shut down in February, 2013. I didn't want to take any of the money offered as I didn't know how things would pan out, and I was offered some substantial donations.
I investigated using an outside administrator (as in website host/designer/builder) but that took alot more money with no real estimate of future costs, as in a base fee this year with no guarantee what next years fee would be, plus an hourly rate to fix problems. With no experience in websites, I had to depend on the honesty of a person looking for my money who I have met on the interweb. That just wasn't an option I wanted to jump into.
So now we have problems, and what to do?
IMO, the only way this site can remain clean is with professional management. Being an Administrator or Moderator is pretty easy and straight forward.
Matching wits with the likes of the person who added those URL's is a full time job that requires more time and know how than anybody I know. That is why shutting down the site is a real option.