If you don't have an ultra-wide, you can't practise and learn and therefore can't improve or master the art of using an ultra-wide.
My thoughts pricisely, but I feel this is the case with virtually all lenses; Macros, Primes, Long Zooms...
You can view all the "sample photos" you want but unless you actually spend some time with a lens, you will never truly appreciate it's quality or viewpoint characteristics.
Kinda sounds like a loving relationship doesn't it :bsmilie: