Is it inappropriae to put expensive items on a bridal registry?

I believe the rule of thumb is 1/3 expensive, 1/3 moderately priced, and 1/3 inexpensive. You're not twisting anyone's arm. Don't forget people will give you gift cards to go towards it just to skip the registry part altogether. For 315 guests and only 3 big ticket items, I certainly do think that's reasonable. I've seen some pretty ridiculous things on wedding registries, like sets of luggage for the whole family, expensive vacuums, etc. for couples who had already cohabited and set up house, had kids, and didn't have a wedding ceremony!