One other one: you work in an environment where that is required for some reason. I’ve known people who got certs because their company contracted for a client

One other one: you work in an environment where that is required for some reason. I’ve known people who got certs because their company contracted for a client who paid more or required some fraction of the staff to be certified. If you work in that kind of area, not leaving money on the table is certainly understandable.