The coin sound effect is inherently satisfying, tapping into human psychology:
The "Ding": The History and Psychology of the Video Game Coin Sound Effect
The sound was created by playing an octave or fourth interval upward at a fast tempo. video_game_coin_beep_sound_effect
Higher-pitched sounds are generally perceived as positive, signaling a "win" or positive reinforcement, similar to receiving money.
Sounds with a low attack (fast startup) and quick end-cutoff feel "snappy" and rewarding. The coin sound effect is inherently satisfying, tapping
The famous coin sound in Super Mario Bros. (1985) was created under strict technical constraints. Composer Koji Kondo used one of the NES's limited sound channels (pulsewave) to create the signature sound.
While the Mario "ding" is the most famous, the "coin beep" has evolved alongside technology: The famous coin sound in Super Mario Bros
Simple, monotonic beeps were standard due to low bit-depth.