Because it’s still a “glamor” job, and it eventually pays OK after a decade + of work. Travel, travel benefits, don’t take your work home with you…if you’re good with people and can do the training it can be a good gig. It should pay better, but nobody gets paid until the door is closed and the plane pushes back. Not even the pilots, but pilot pay can be high enough to account for all the time at work outside the “door closed at departure and door open at destination” pay clock where the flight attendants are stuck dealing with passengers on a plane even if the door is closed sitting at the gate and they don’t get paid.