Thoughts on Rollyo and LibraryThing

I like LibraryThing a lot. It is great to be able to catalog your own personal library collection. I was also thinking that it would be useful if someone had a very old book and wanted to know what it was worth. They could find someone else on LibraryThing who had the same book and maybe be able to find out something about it's value. I have an older children's book, and I typed in the title, but there were no other people with that title in their collection. It was worth a try. I think next time I get a reference question about a book's value, I will add LibraryThing to my list of sources to check.
I thought Rollyo was fun, but don't see that I will be using it too much.