In his very first issue, he decides not to join a team out of spite.
Maybe that’s why he refused repeated invites to join The Avengers?
I love how in these early issues he’s still really out for himself and money–despite Uncle Ben’s death. It makes sense to me. Very few people, if any, truly change based on one dramatic event. For most of us, the dramatic event begins the change, but our true values and motives develop over time.