Because you do it out of passion, as well as hoping it will bring better opportunity. It's like you're investing in yourself, so although you don't see anything up front there's always the possibility that the kind of compensation that is priceless can come later. For someone who's striving to get where they're meant to be, opportunity over a quick buck is something that will always be taken by the wise. Because they know opportunity is king, and all other benefits will follow...