I wo

l would argue that just because someone puts something in their signaure is not an evidence of a concept 'working'. Maybe even this poll is a reflection of that...

Anyway, to be somewhat constructive, even though that last post didn't exactly entice that as it's 'working' and '...no luck required':

Instead of just having people decide that they want to be a greeter why not place some more rule-sets around it. A rules of conduct was brought up.

Every six months, or when there's a need, go out and ask for volunteers.
Create a poll where people can vote on the candidates.
Open-source, open community. People can look up posts-thanks ratio, posting history, etc before they cast their vote.

Make the Greeter Post a sticky in the Community forum.