I do agree that such unethical moves made by that couple is utterly disappointed. It is not the angbao that counts, but it is the thought that the couple should consider when your brothers / jie mei are not obliged to wake up early in the morning, polish cars, purposely buy a dress for your dinner, taking leaves, going to great ends to ensure that your wedding turns out well
Any ang bao of reasonable amount is a kind gesture of thanking your friends for the great help that they have put in making your event a successful one. Furthermore, a red packet is a must (auspicious purposes)
Well, your friend must have tasked someone on that fateful night in ensuring that all ang baos collected for the night are being named so that they would know how much to expect from their guests, so..., the same goes for your own brudders and jie meis. This is something that you should not save
I, for one, do not advocate the naming of the ang baos. We wanted to share our joyous occassion with our best friends and relatives and want them to witness and gave us blessings in united as one. A dinner is to complement their kind presence and blessings. If they were to be generous to hand us a red packet for good luck, we should accept it with grace and not harping on if we do make a loss or profit or breakeven. I'm sure most of us shares the same concept