Not being funny, but nothing annoys me more than people requesting cash or money towards something as a present. It's a wedding, you are getting married because of love.
it really grates my foreskin when people spend thousands on their big day and then expect you to help cover some of the costs with a financial gift....
one of the GF's mates complained about the cost of their wedding, 30k+, and that they recieved only about 7k (7k!). then she complained that they couldn't afford their new house as they didn't have a desposit ready.
needless to say i have little time for her.
one of the best weddings i have been to took place in the local registary office and the reception was held in a back garden. about 70 people, loads of buffet food, no crappy band or DJ... just really relaxed, no fuss event.