Hello!!
Do not feel bad at all!! First, it is your wedding and you should do exactly what you want to do. Secondly even if it is $2000 a person they only need to save 250 a month to be able to go, if they can't do that then it is not your problem. Yes, having a bunch of people there would be great, but the ones that come will be the people that are in your life forever and they care the most about you and your fiance. Once everyone is out there they will realize that it was fun to take a big family vacation, and most people need the vacation! Do not feel bad when you are planning a wedding it is supposed to be fun, just brush it off and do what you want. They have pleanty of time!
I hope things turn around for you!
Jackie