Can someone explain the "wedding gift should be the cost of your meal" thing?

Have you heard of this? I never heard of it before skimming though Y!A wedding section. People say they find out the per-plate cost and give gifts accordingly? I'm not trying to slam it, it seems like a good idea in theory. I just don't understand how a guest would know how much a couple is spending... show more Have you heard of this?
I never heard of it before skimming though Y!A wedding section.
People say they find out the per-plate cost and give gifts accordingly?
I'm not trying to slam it, it seems like a good idea in theory.
I just don't understand how a guest would know how much a couple is spending per plate. Do they call the caterer? Do they guess from the venue location? From how fancy the invite is? From what they ate the last time they were at the bride to be's home for cocktails? ;)
Do they call the couple and *gasp* ask them how much they are spending to feed you? Seriously! I just don't get it- can someone explain this to me please?

=)
BTB 4*12*08
Update: Yes I'm being facetious-
I don't literaly think people would call the caterer.
=)
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