I don't think it's rude. and if anything people should be happy, It's alot cheaper than a gift. Your going to get alot of mixed reviews on here, but put yourself on the opposite end, if you went to a wedding and this was the case, how would you feel. Despite all the rules of etiquette, my bridesmaids are hosting me a money shower, to help with a down payment on our house. most people understand these days