Did you know that the first slot machine was created out of San Francisco car mechanic George Fey’s basement in 1895? It was a simple, mechanical machine with three spinning reels, called the "Liberty Bell" with a maximum payout of fifty cents.
In the early 1930s slot machines became more widespread and were continually improved upon and elaborated into the 1970s, when another major change took place as manufacturers introduced fully electronic, microchip controlled slot machines using random number generators to produce the combination of spinning reels. Today, the slot machine is an incredibly refined technology, explicitly designed to deliver maximum entertainment to the user and maximum profit to the casino as the machines are known to be the most profitable gambling game in casinos, bringing in 70% of an average income.
How do they do that? It is not so complicated, as they base up and take advantage of basic human psychology to maximize their appeal. Playing a slot machine requires no skill, intellect, or decision-making ability so this non-threatening aspect is critical to the appeal of slot machines versus other casino games.
They are also appealing for the fact that literally every coin a player puts in has a possibility of eliciting a huge payout, this aspect providing initial and continued stimulus to the player. One other tempting feature of the machines is the high frequency of “near misses” or situations in which the player believes they have almost won. We all know how two out of the three jackpot bars displayed ruffles the adrenalin level and push us to play more. This feeling spiced up with the ringing bells, flashing lights and other sounds are other secondary conditioning mechanisms that keep the player stimulated, so no wonder that since 1895 slot machines gain bigger popularity among casino fans.