Back in 2015, a Wii U game came out called Devil's Third. I don't recall all the details, but there was some development drama and through some weird circumstances the USA only got a small number of physical copies of the game (< 600 maybe?). Anyway, I decided to buy one on launch day for $60. At worst, I wasted $60 on a mediocre game. At best, maybe I'd make some money a few years later.
The latter happened. I did beat the game back in 2015/2016. Not a very good one. Anyway, I decided to look it up on a whim the other day and saw copies for sale for about $300, give or take. Mine ended up selling for $275! After accounting for what I paid for it and shipping to the buyer, I made about $200 profit.
Not a very calculated form of badassity - more luck. But it worked out!