I know, my fiance wants to give the ushers something, but to me the present is being asked to be an usher, they get a nice smart suit and dont have to do much other than hand order of service out, i'd rather just buy them a beer! And we are having to get grooms mum something just for the sake of it really, because otherwise she'd be the only one on the top table without a present. Tho I suppose she does look after step son alot which is a great help.
All this giving gifts is a bit OTT, i dont think people help at a wedding because they expect a gift, its usually because they'd like to help and be part of it. I wouldnt expect anything.