There is no work or talent required. Being a movie extra requires work and talent. So, yes, definitely, you can make a living being an extra. The best pay for extras/background players is if you’re in the union (SAG/AFTRA) in California which is about $22 hr.
Can I wear jeans to an audition?
You don’t need to dress like you’re going in for a corporate interview here. Your clothes shouldn’t be a wrinkled mess, but you also shouldn’t be wearing business attire to an audition. A good pair of jeans can go a long way, and it’s worth investing in a pair for auditions alone.