Hi Minssy,
Of cos if I receive $20, then too bad lah..cannot complain.
But I'm just stating how much I will give. For me and my peers, we normally give around $80-$100. We want to make sure the bride and groom can recover the cost of the dinner. Not forgetting, other than the table cost, there is cost of beer, wine, liquor etc that are also part of the cost.