After all, knowing that someone has a Bulbasaur, Charmander, and Squirtle means one generation is complete, and while that one's pretty simple, it can be confusing to remember which generation Pokemon like Fennekin and Snivy belong
Wizards accidentally printed not only one of the most broken combo engines ever but also one of the most miserable
Because everyone calibrates it differently
The best case for this is off a Sneak Attack where you deal 10 and gain 5, nice but only have the job and no lasting value or disruption
The closest I could find to anybody doing it in the mainstream recently was Artifact (I know, I know, I'm stretching the word "mainstream" here) with a slightly bastardised version of the concept handled via Steam's marketplace, and even then it's still an online auction house, not just doing fun swaps with your pals and saying "well I've got this, what've you got?", like exchanging the best parts of your packed lunches at school