Do you need to take more classes? No. Should you take more classes? That's really up to you. I would think you could learn some very helpful things given the right class, but I've also taken classes in many subjects that were so bad I didn't learn a thing.

I'm always on the side of learning more. I think the more you know and the more informed you more capapble you are of making good decisions.

Where that learning comes from is up to you. It could be a class, it could be reading books, it could be from forums like this one and others. So much of running a business isn't going to be taught anywhere. A lot can be, but some things seem to just take the experience of doing and seeing what works.

Mnay people have succeeded without a business degree. I suspect most did their research, but not necessarily in a classroom.