That's a good size. My wife and I had 13 guests (immediate family) at our wedding. We held ours in the zen garden at my church. We later had a reception (basically just a party) with about 100 friends and family members.
To answer your original question, I think the trend is getting larger and larger. People seem to feel pressure to outdo their friends. There are several TV shows, multiple magazines and an entire industry that try to feed the frenzy.
In my opinion, we're just as married as the people who spent 10 times as much.
I agree, obviously if you read the thread. This is kid 3 to be married, 2 more to go. I'm keeping my fingers crossed.