I'm still following this thread in amazement. The standard pay for your plate Dis debate has now turned into pay for your seat!
(That doesn't mean I don't get that it's poor planning not to have enough seats, it just means I don't get how a poorly planned wedding determines the amount of the gift. For those that have no idea why I would say that - I'm from the "give a gift based on my relationship with the bride and groom" side of this old DIS argument, not the "give a gift based on the wedding" side.)
It's the rudeness of 'we don't care if our guests can sit or not'... it would feel like a money grab to me.