You know back in the day, when I got married, no one other than the MOB and MOG would have ever dreamed of arguing with a bride about wanting to add additional guests to the guest list. It was just bad form. There was also an understanding that money is not limitless. In our case, that was especially true. So when I got married, the only guests who could bring guests were those in the wedding party. Everyone else went 'stag'. No one complained, no one turned down the invitation, everyone still tells me it was the best wedding they've ever attended.
Times have changed. People are no longer sharing in your day and being served good food and drink, dancing, and having a good time. That is no longer enough for today's guests. Having been in the bridal industry, I have said recently that the real bridezillas are not the brides, but the guests who these days bring not a gift but a sense of entitlement to the proceedings.
Here is what I know from being in the business: Brides cannot win. If they don't provide superduper food and entertainment, they are cheap and horrible. If they don't invite everyone who has any reason whatsoever to want a ticket, they are horrible. If they have great food and drink, they must be mortgaging their future to waste their money on one day. If they have a large enough wedding to accomodate all of the demands for invitations, then they clearly invited all 'those' people for a blatant gift grab. If they can't afford to be everything to everybody, then they should have just eloped and spared us the 'disappointment' of attending an event that's not up to 'our' standards. And on and on and on.
So here's my advice: Don't like who's been invited or not been invited? Then don't go. Don't like the food, location, religious/non-religious nature of the service, or accomodations? Then don't go. Don't have a babysitter? Then don't go.