I might have done the buy and return years ago, but I'd feel too guilty these days given the state of the economy. Most towns have a rental company or maybe a small studio that rents amps, so that's an option if you really feel the creative need to make your own profiles.
Honestly though, there are so many great profiles available of amps that I'm never going to see even in a Guitar Center or anywhere else in my lifetime, that I don't see the need of me ever profiling an amp myself. I have pretty good ears, but I will never profile an amp like And44 and some of the other famous profilers on this forum, so why bother? As far as profiling an amp to my liking with different tweaks, the commercial amp profiles And44 does have several different variations that cover any knob twiddling I would do anyway.
As an analogy, I love good coffee, but I see no need for me to grow my own beans, harvest them, and roast them when there's a Starbucks every 200 feet. If you hate Starbucks, then insert your own preferred brand in its place.
The only real amp I still own after having my Kemper for several months is my trusty Fender Champ, and that's mostly for sentimental reasons.