Interest will rise depends on what sports is so famous in your community
[snip]
Well this is right --it will depend on which country you are in so if your community has a sport of handball, then there is no reason you have an interest in it but in my country, only basketball is a very common sport that we enjoyed so that is we got interests. The adoption of the sport was based on the country where you live and also boxing here is the common sports that people love.
I am more interested in basketball and boxing, same as you. So when I bet, mostly in basketball. But from time to time, if I know the boxers involve, I also bet. You will be more confident to bet on a sports you are already familiar with because you are rooting for someone to win. So that added excitement on my part. Each country has their own like national or favorite sports, so each one of us may vary with our choices.