I like to put many attributes on one line too. It fills the page better, making it easier for me to take in: 80 characters wide by 50 lines long, instead of 20 characters wide by 200 lines long.
Besides I like that it also gives me a better sense of how verbose some of the rules are and if some of the properties could be removed entirely. When the hierarchy of those rules is more apparent with the more compact style, I'm more likely to see unnecessary properties (which are inherited) and therefore trim up the code.