So, you've got a new user. They ask a really poor question (P.SE 10k link) poorly written, off topic, or any other number of other things.
There is no way to redeem such a question on the site, it falls into the embarrassingly bad category and got deleted. There is only so much down voting and trying to help in the comments can be done (comments are a poor way to educate someone about the fundamentals of asking a question on Stack Exchange... but thats another matter).
One difficulty in this entire process is that it means that without that sympathy up vote on the misasked question on the main site, the OP is completely unable to ask on the per site meta.
Help > Privileges > Participate in Meta
Participate In Meta
Privilege Type: Communication Privilege
Awarded At: 5 Reputation
And so, the person who asks a really poor question can't get to meta to ask why its really poor without a sympathy up vote.
And so, without excess bouncing of a person through the meta bureaucracy, how can we actually get someone to be able to ask on meta with only 1 rep?
Ok... so the reasoning behind this is:
Because we allow anonymous participation, we require a small bit of parent site reputation to prevent spam, and ensure that meta is for active, engaged members of the community.
Unfortunately, I don't know how often other sites get meta spam... or how prevalent it was in days before this permission was put in place.
Is the requirement of 5 rep or a registered user sufficient to keep away the meta spam while allowing people who genuinely need help the ability to post on meta (without coming over to MSE where the question is off topic)?