There are many reasons why people like online casinos: flexible hours, a wide range of opportunities, real fun, and a lot of bonuses. No need to leave home to earn money. In short, have as much fun as you want. I think it's a great alternative to a real casino, although it has its own charm.
I don't quite understand the relation between real fun and online casino, I guess many people in virtual/online are easier to make such fake smile/laugh on chat/text but the truth they're didn't even smiling. But I'm not saying everyone wouldn't make a fun with online casino since there are some people who can't gamble because of their jurisdictions or their privacy concern.
Personally I think traditional casino is more real fun rather than online casino since you're freely to get free drink, met your friends and have a real adrenaline.