Ok, right back at ya - Don't argue if you're on a blacklist.
I think what guys are saying is that because of the lack of accountability of those sites, guys should not give providers personal information. That hurts YOU. From my experience in the hobby, few providers ever asked me for much of anything in the way of screening, so the guys have a lot less incentive to provide information to see providers who want a lot of personal information.
Given the choice, I doubt there are many, if any, clients who want to see any provider badly enough to risk having their personal information posted where it's publically viewable when they can see a provider who won't ask them for that personal information. We don't know you either, so we have no idea what you will do with that information. Once that information is given out, it cannot be taken back.
If getting a client's personal information is important to you, police yourselves and make sure that there is some accountability and discretion with regard to reporting clients. In particular, if you report a client to a dns list which posts his personal information on a publically accessible website, you have outed that client to his family, friends, employer and evryone else just as if you called those people.
Discretion is (or ought to be) a provider's most important business asset. If you out clients or even support the idea of outing clients to their family, friends and employers for something like an NCNS, no one who values discretion will want to see you. That's bad for your business as long as there are providers who exercise more discretion.
Now, is it abused? No more and no less than the provider review system is.
How often has your real name been posted in a review? Do you think your personal information should be posted in public in a bad review or if you NCNS a client? If not, you cannot justify support for a website which does those things to clients without having a very weird sense of ethics.