I was dating someone at the time; and I'm pretty confident that my cousin didn't like him, and that was her reasoning for inviting me the way she did. More than the guest thing, I was really upset that she didn't send me my own invitation. I was in the bridal party and I lived in a different state than my parents (I was in my mid-20's), but I didn't even get the courteousy of my own invitation, guest or no guest. An invitation with no guest, I would have thought the space/money issue as well. On the other hand, with my own wedding, we had space issues (fire code limits for the building) so had to limit our list, and we didn't invite people if we couldn't allow them to bring a guest. In our situation, we thought that was the best thing to do, though I realize with larger families or other situations, this may not be the best way for other people to do it.