When H & I got married, we invited 185 people on one list at one time, had a little over 100 people who RSVPed yes, and 3 no-shows to the wedding (plus one couple who brought an uninvited and un-RSVPed-for kid). That's it. Normal. The only rudeness was from the couple who brought the kid.
A while back, a couple of our friends got engaged and told us at one of their parties that OF COURSE we'd be invited to the wedding. On a later date, she even called & discussed the date with us, since they were considering getting married on my H's birthday (which they did choose) and were actually making sure we didn't mind (we didn't, of course). Now, I know all too well how expensive weddings are, especially in this part of the country, and would never expect an invitation until you tell me to. A few months later, the female half of the couple and I were messaging back & forth on FB about something entirely different, when she suddenly comes up with, "Oh, since I have you online, I just wanted to let you know that since our parents are paying for the wedding and we have big families, we won't be able to invite you & your H, unless we get a lot of "no" responses & then I'll be able to send you an invitation. But we'll be having a second backyard-BBQ reception in the summer, and you'll be invited to that! Oh, and you & your H are invited to the ceremony at the church!"
So basically, the message was: We invited you verbally and even discussed/cleared the date with you, but you're not invited anymore. Except hopefully we can B-list you. And if not, it's ok anyway, because you (an agnostic Jew) can spend your (atheist - and they know this) H's birthday sitting through a VERY long Catholic mass-filled ceremony & then go home and not celebrate with us, but come to the second tier consolation "reception" months later.
Um... no.
(Note: I get that I didn't get a STD or invitation to the wedding, so even with the verbal "of course," plans and budgets can change, so I couldn't truly expect an invitation. It's not so much that [though it was disappointing; I really like this couple and love weddings], as everything that came as a result of that.)
I would never pull any of the above. On the other hand, I also never realized how annoyed *I* would be if it was pulled on me... until it was. H actually barely wants to hang out with them anymore over the rudeness of it all.
You only live once, but if you do it right, once is enough. ~Mae West