In Laws Keep Inviting People - rant

My FH and I started by making a tentative guest list, with about 180 people on it. We knew this was a big wedding, so we discussed eloping instead, but knew our families would be very disappointed. So we started looking at venues and took a long time to set our budget. We carefully planned everything, down to the tips and decor. Once we showed our guest lists to our families they both needed to add some people. My parents added maybe 10-15 people, and these are people that I totally agreed needed to come I just forgot. My FH's side added way more. Basically our list is now at 260 people. But all of FH's family are OOT, so hopefully a lot won't come. They kept saying "Well we have to invite...but they probably won't come" and now we are getting some RSVP's that are YES. Keep in mind my FH's parents have contributed SOME money, just about 1/4 of our whole budget. They always offer to give us more, but they haven't followed through. I'm just so annoyed. They added another person today.