Acting is an art form and you want to take roles that are challenged and it's more of a challenge I think to play dark characters. Not that I want to always play those, but it is a challenge and challenges are rewarding and fun. ↗
I don't hate work, composing is not work for me, it's my pleasure; it's my life. So why should I stop? If something is pleasurable and exciting and rewarding, why should one stop? ↗