by the looks of it, i think people are seeing where PL is coming from, and to the sort of people he is aiming at, and i think he is trying to protect brides and grooms and credibility in his job.
i would say this thread isnt aimed at anyone who understands what the camera is and how to use it properly. more towards "buy camera, im a pro" types. the wedding tog job is to get a visual copy of the big day, you cock it up, then they can get very upset over it, it is not like a studio where you make a mistake, you can offer to reshoot. they spent hundreds or thousands on the day and it is a once in a lifetime thing hopefully.
that said, i also understand the people who come on and ask advice, as they have to shoot friend/family wedding as the budget wont stretch(they are already using family cars for transport, the whole thing has been done on favours and tight budgets). as the one with the dslr, you become the tog for the day(and hopefully you have explained what your abilities are).
there are other things to consider though, weddings normally contain a lot of people and if you are a hobbyist(as in not usually earn money of it), what happens when accidently kicks your camera bag and smashes your 70-200 f2.8is lens, trips over smashes there arm on a table and cut themselves with glass and sue you? do you have the relevant insurance to cover all this?
in the end, as long as the b&g are aware of your ability and they are happy, good luck and hope you dont have the problem. im sure many a friendship has/will be ended when/if something goes wrong.