This is getting way too personal, and significantly off-topic. The OP's abilities aren't really in play here.
It is interesting to observe these discussions from a neutral position. I really don't have a dog in this fight. For some reason, it seems to bring out serious passions from people on both sides of the proposition. It's the main reason we no longer have a Wedding Forum here; it simply got too nasty, so the moderators shut it down.
The point is, some of you (like the OP) feel there should be a prescribed course of apprenticeship and/or training before a person is allowed to take on the responsibility of photographing a wedding. Others argue that the best way to learn is by doing, for free if necessary.
Nobody is right, and everybody is right. But getting snotty with each other does not advance the debate, and only exacerbates the same old problem we've had in the past with these sorts of discussions. If you can't make a cogent argument in defense of your position without punctuating it with personal attacks, chances are your argument is not well thought out.
Let's keep these discussions friendly. In the absence of civility, they serve no worthwhile purpose, and accomplish nothing towards promoting your point of view.