Someone else can correct me if I'm mistaken, but yes, to my knowledge the ability to customize the aesthetics of UAPP do not change with the purchased version.
I would offer a slightly different perspective on it, though: until this point, really nobody has made any effort to create an application that finally allows mobile audiophiles the ability to use their Android devices as sources into a wide range of DACs. Davey has started and built this thing from the ground up, and as we are still relatively early in the process (UAPP still has a ways to go before it's first birthday, if I recall correctly), there are still a number of things that can be (and doubtless will be) incorporated into the application itself. Given that there are still functional and feature opportunities with the application, it looks like Davey has opted to focus his efforts on making the app work better rather than look better at the moment-- an emphasis I tend to agree with.
Ultimately, it would be awesome if UAPP was completely finished, had every feature and capability that it ever will, and thus had already been polished up from a UI perspective. But realistically, all of those things take time, and Davey is (to my knowledge) the only person working to bring us this functionality. The app keeps getting better as time goes on, and I would expect that at some point most of the features and functions we hope for will be incorporated, and that the UI might get a little facelift. But ultimately, I'm happy that the app exists, that someone is working on it to make it better, and that (in the grand scheme of things) it's so affordable to have.
You are, of course, free to have whatever opinion you'd like, and spend your money where you please. I just think that this is still very early going for the app, and that we're progressing at a reasonable pace towards making it even better, and thought I'd share my point of view.
Cheers!
. Great minds think alike, I 'spose!! 
