Esperanto is interesting and several lf my family members speak it, so I'm not against learning it but English is <em>the</em> international language at the moment, so Esperanto isn't really necessary and I learn languages not because I need them for communication but because I'm interested in learning more about different cultures, traditions and literature. I find it much more interesting to explore the abundance of natural languages that developed over a long time than constructed languages with a short history.

I'm not interested in artificial languages. A culture's history, mentality, and traditions reflect in its language; that's what makes this language interesting for me. 

You could try to persuade some big-name pop stars and rappers to compose and sing songs in Esperanto. I think it would become a lot more popular then.

I am not learning Esperanto because it is not popular. I only learn popular languages.

Each language has a culture behind it and developed after hundreds of years. Esperanto is a new language and people who speak it are scarce. Besides, there is no proper culture behind it. Therefore, it is not really popular.