First and foremost, the Gods are everything. If we are to believe, as the Orphic Hymns suggest, that they are in everything, even in the air we venerate (Hymn to Hera), then we live and breathe the Gods. Each day, they give us what we need for our survival, success and also enjoyment of life. I worship them in gratitude for all that they give and do for humanity, the world and universe. It's about their due honor. Rarely do I worship the Gods because I want something in return. It's about respecting what is and being grateful for what I have as a human being.
Second, simply the pleasure of it. Praying and offering to the Gods on a daily basis brings bliss into my life. It's not uncommon at all for a Hellenist to feel extremely wonderful each time they pray, pour a libation or perform a ritual, and that's because the presence of the Gods is simply wondrous. It releases of all pain, fear and worry, and lifts you into a higher state. Simply put, I do it because of the bliss.
Third, I have dedicated my life to the Gods. Not only because I am a priest, but because they have done so much for me and my family during my lifetime, more than I may be worthy of in life, I don't know. But for the blessings they have given thus far, it's the splendor that a man can ask for, and thus, I am grateful.
If nothing else, I would do it simply because of how amazing the Gods are. Their history, religion, myths, mysteries, temples, all of the things that make them intriguing and wonderful. There is a common human need to have something higher than ourselves. We are born looking for the Gods. It gives us purpose beyond the mundane, if you want to call it that. When we know there's more to this life than just the basics, we tend to become happier and more enlightened.
In the Goodness of the Gods,
I'll see you at the next Herm down the road,
Chris Aldridge.