Some significant ones I think you've left out:
1. The sheer thrill of it. Distinct from "partying" because as written, the latter seems to refer to the fun derived from things other than the adventures themselves, with adventuring being a means the twin ends of of gaining access to, and being able to afford, new and exciting ways of giving one's rational faculties the night off.
2. Loyalty / companionship. The character's friends are doing it and he wants to be with them, or the character doesn't otherwise fit into society and the party accepts him.