Sentimental doesn't abide by reason/logic, it's bound by emotion and nostalgia. If you hold that emotional value with the feeling of nostalgia, would money really be the first thing on your mind? With trading cards, i still have all of mine somewhere. Something i collected as a kid was lego, i held onto that and gave it my cousin 12 years younger than me. I mean i wanted to give it to him to enjoy based on my memories and feelings rather than any financial gain.
I just think how can you just write off a piece of you, something you invested in for $100. Something you can easily make in a days work. Don't get me wrong i know people can be in tough situations and be forced to do things like sell things of value. It's just not a regular thing i would see someone doing with the invested current emotion.
I mean AB is a bit more than that. Imagine spending years working towards and grinding to form something personal to you. Creating customs and bios and putting in the effort to build the bio that is perfect to suit you. Do you really feel so emotional to it to give it up for a sum like that?
Personally i'd think no. But each to their own.