I've been to two weddings where a significant number of guests were from OOT. One wedding blocked rooms at a hotel for guests and the other didn't. The wedding with blocked rooms made it easy to find a hotel at a decent rate, but turns out the hotel was a 45 minute drive from the ceremony/reception (both in the middle of nowhere). The wedding without blocked rooms left us with a difficult time finding a hotel that was in our price range, but we ended up getting a nice one about a 10 minute drive from the ceremony/reception.
Our wedding will be mostly OOT guests, and I'm wondering if it's etiquette to block hotel rooms, or if it's just a courtesy.