I've had some knives that I bought for a specific aesthetic reason, like particularly attractive handles, etc. After receiving them, I sometimes was on the fence for awhile, in deciding if I liked them as well for purely functional purposes. In cases like that, I've dropped them into my pocket and carried them for a 'trial run', if you will, to see if I really wanted to establish it as a user. The ones that made me hesitate usually had issues with blade grinds or profiles that weren't necessarily my favorites; and making a commitment to use them usually meant I was going to have to do some pretty heavy reprofiling or whatever, to make them usable to my satsifaction. So, I'd carry them for awhile, to decide if it was worth the extra work or not. Some got weeded out because I discovered they didn't carry as comfortably in-pocket as I prefer, because they were too large or too bulky, odd shape, unevenly balanced, etc. It's very rare when I devote extra work to those, in reprofiling blades or whatever, knowing I won't really like carrying them anyway.
I still have quite a few of those 'maybe' knives. And unfortunately, they spend most of their time stashed away somewhere. Once in a while, I'll get a wild hair to drop them in my pocket again, to revisit the possibility of making it a regular-carry knife.