Opportunities come and go. I was working on a job for some smaller companies and ghostwriting articles here and there. Got recommended to an even bigger company who wanted me working with them. Unfortunately, the workload would've been too much alongside classes. I did play with the idea of dropping out for a year to get my foot into the door, but decided it was too risky and declined.
It really depends on your situation. If you think you can go far with it, go for it. But if it's something trivial like working a dead-end job at a chain grocer or something like that, you're better off staying in school.