I do like looking at new styles when they're added, but I rarely change my journal's style so whether the selection is all the new styles or a randomized selection of styles won't really affect me personally. A randomized selection seems easier to maintain, and randomized could possibly be a good way for people customizing their journal for the first time to get a broad view of what sort of styles are available as well as dig older styles out of the back pages for more people to see.