Originally Posted by
SirBrighton
Slot machines in the Gold Saucer would be very problematic. People could abuse them by using 3rd-party software to play them while they're AFK.
Also, slot machines operate purely on RNG whereas every other attraction (besides Any Way the Wind Blows) requires skill to win at and can be beaten easily if you know how.
You could potentially pour all of your MGP into a slot machine and never win once.
In short, slot machines can be played by bots, require no skill to play, can't be beaten reliably and personally aren't fun.