I gave a bunch of towels to Gabe and Tonda for their wedding. It was a bit of an inside joke since I had walked in on Gabe in nothing but a towel when I was visiting there
I wanted to make sure he had a continuous "guest wardrobe" ;)
I agree about the wedding registry there - it's there for a reason. Also 99% of how much you "spend" depends on how well you know them. If I get an invitation for a friend of a friend of a friend's daughter whom I've met once, I'll spend $25-30. But if one of my best friends gets married, I'll go up a few dollars