Disclaimer: I design the machines and games for a living. 1) regarding near miss, with basic math knowledge you can easily calculate the odds of near miss. Eg. with 2 special symbols per 30 symbol reel, for a 3x5 reel game, you have a 1:5 chance of seeing the special symbol per reel, or once per spin for a 5 reel game. The odds of a 4 symbol near miss is (1:5)^4, which is 1:625, or once every 30 minutes. With a bank…
3. Yes, but they are designed to be as addictive as possible. I'm quite appalled by online slots (Android, iPhone) where no money is at stake, but coins can be purchased, and the amount of coins purchasable is adjusted based on how much you play. I'm thinking Zynga based games primarily.
5. That's fair but a weak argument. 100% of people who go to the theatre or eat out spend money, but the amount is fixed and known up front. I guess you can say the same for slots when the payout percentage is up front, but still, Vegas wasn't built by giving away money.