Thiago, "we eat to live but we don't live to eat", haha ;) I know that you won't be offended, that's why I write this, but I think food mustn't be a reason for being happy...)

For now they are the following: good health, time for self development (spiritual, mental, physical) and a sense of inner harmony and balance.

I think however these reasons can change many times during lifetime.

Also when you start learning a new language, immerse into it, know more about the culture of the country and the native speakers, you are more likely to get used and even love a language and the way it sounds even if you had the opposite opinion before. I think language learners will understand :)

For me, it often depends on who is speaking (his voice tembre, loudness, etc.) and sometimes also on your attitude to the speaker. One and the same language can sound gorgeous or not so beautiful or even ugly. For example, German is often consedered to be rough and many people don't like how it sounds. Nevertheless, I like it and one of the reasons is that I loved and respected my German teacher when I studied at University, she was so kind, patient and interesting woman that I have only good memories about our German classes and the language in general. And I heard German songs that sounded really beautiful. At the same time many people like French very much but sometimes when I hear it I don't share this opinion. Probably, it also depends on peculiarities of the particular accent.