If you need reason to invest in bitcoin, I believe you should do your own research yourself and stop asking questions like this. There are so many resources and article you can google to know what bitcoin is all about and how you can benefit from it.

There are so many threads as well on this forum where you can view people's opinion about bitcoin. If the difference in value as from 2009 till date is not enough for you to know that bitcoin is profitable, then I guess there is nothing we can all tell you here.