There are no casinos close to my home so playing online is much more convenient. I go to a casino at least once a month with friends but I still prefer playing online.
You have no choice if there's no casino close to your home.
And most of the gamblers that is on the same situation as yours would probably say the same thing.
And that is a real advantage for people who are far from offline casinos because online casinos can provide services similar to those found in offline casinos. With online casino we can save some money for travel costs.