It's the Principle! (Invite vs. No Invite?) RSVP for Gods Sake!

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My little guy is turning 5 this weekend and we're having a party for him. I sent out invites to friends and family and even gave him invites to give out to his friends from school & camp... My first question is why in heaven's name don't people RSVP when it's requested???!! This is so rude and inconsiderate! Out of 10 invites given to school/camp kids, only ONE responded! My second question is, would you invite more people just to have a full house/party even if you don't care for them? I ask because my son's dad thinks it's better to have a ton of people here, even if it means we have some here that we don't like, than to have a smaller gathering with only those who we like... He wants to include extended family (Gramma's husband's kids/grandkid) just so we have 3 additional children here to play with our son. He says we should invite them, even though the chances of them actually showing up are slim to none. Invite everyone, they won't show up, and we know we offered to include them. I say, you don't make a show of being nice just to say 'we offered' because then what happens when the DO show up?? You have to assume they WILL come! Then you have a house full of people you can't stand!! You don't invite people who you don't want to be there! I'm not going to invite people I don't like and we don't socialize with, who have monsters for children, to my home just so there's more bodies here. My point is quality/quantity. What do you think?? Sidenote: 25 guests have confirmed they will be here, including 6 of his little friends... so I think the party is more than large enough and will be more than sufficient to show him a good time. What do you think??