Who pays for what is really tricky. There is what tradition dictates and there is what makes sense for the couple.
My fiance and I decided that we would pay for our wedding ourselves in part because I did not want the wedding that my parents could afford to give to me and in part because I thought asking my FI's parents to shell out for a second wedding for my fiance would be unfair.
Because of our fixed budget and what we prioritized (number of guests, great food and alcohol in taste and variety, great venue, and coordinator), there are many things that we will not be able to afford (professional photography, professional videography, new wedding bands, bouquets for bridesmaids and boutonnieres for groomsmen). Like so many of the families of the ladies on this board, my family knows that we are paying for this ourselves and has begun to make offers to help how they can. For example, my mom has offered her wedding dress, my sister has offered us her time share for our honeymoon, and my uncle has offered us his home for our welcome/rehearsal dinner/party. We are so grateful for these offers.
Our wedding is not for a year yet, but I'm interested to see whether my FI mother will offer anything. We are not expecting anything from anyone, but I think her offering something/anything would be a nice sentiment that would show that she's interested in helping to make this a happy event for us. As my dad would say, "Put your money where your mouth is".