in one thread, i think someone posted a link of these invites from a hindu-muslim wedding where the invites were stitched together. they were really pretty! couldnt you get that done easily in pakistan? I think the only down-side to that is people generally invite people to some events and not others (e.g. someone might only get invited to the shaadi, but not the mehndi) and in a booklet-type invitation, you'd have each event on a separate page.
That's a very valid point. I guess some people may go with 2 types of invites ; one the more expensive kind(booklet for close freinds and family) and the other regular.