Why would a board game be that expensive?

I searched the Internet, wanted to clarify the price, I thought it was 25 rubles of USSR, one video author said 20 rubles. So the price was about that. The salary was about 100 rubles.
The state could not release and sell this game. Since this is capitalism - such an idea simply could not exist. The game was released by some businessmen and entrepreneurs, it was a curiosity, a rarity - that's why the price is so high. So my friend and I talked about audio cassettes. They were also sold extremely expensively, also 25 rubles. That is, you could buy your favorite music for 4 rubles on your monthly salary.