I've probably mentioned this before but Pachinko is huge in Japan and the reason is is because it's gambling. Just like slot machines in Legas. Slot Machines are also hugely popular and people take it all extremely seriously. I know people that made their living playing pachinko or slots 8+ hours a day.
That's one reason slot machine simulations for PS2 etc sell decently in Japan. The guys that take their gambling seriously want to practice. They need to know every combination etc. The slots and pachinko in Japan actually allow some degree of skill to increase your chances.
With that in mind there are actually controllers you can buy for your PS2 so you can get the full practice experience. Sammy even makes a specific controller for practicing their most popular slot machine.