I use it just for gambling, Can't buy any food, car .. in my country.
You may have heard about only gambling available with bitcoin, but there are a lot of things available online which you can buy with bitcoin, you can do your shopping online with your bitcoin.
There are many websites accepting payments in Bitcoin but the service is not available in most of the countries so for us it is pointless to the things we can buy. Therefore, most of the bitcoins is only spent on gambling websites. And to add your mobile balance.
Yes even sites have started to accept bitcoin as a mode of payment but it is not beneficial to the customers from third world countries as shipping costs are too high.