You generally strike me as being useful, albeit not in a very immediate way. Sort of like the random stuff that fills the cupboards at work -- we don't actually need it at the moment, but it's clearly good stuff, and we'll doubtless have some need for it at some point, and if we don't, someone else will.

As for beauty, I think some of your writings here have something like that -- that last sentence for instance.

This comment by contrast, really is neither useful nor beautiful. It doesn't even relate to what you're writing about.