It is safe to say that you should follow the license under which perl itself is.

I would for myself restate the question - Could I sell perl without source, with some limitations- charge for it?

No.

We write software at work and we make money hacking together systems. We don't sell software or charge for it. We charge for time and we may rent out systems- servers with software.

I think anything in the gist of creating proprietary software, which is what your idea sounds like here- is going to fly into problems. You can still make money with your programs. You'll just have to learn a different way of how to do that. It's so much better in the long run.

Besides, anything you can code- I will code. Only mine will be gnu or some other that lets everyone contribute and redistribute with source- so mine will be better than yours very quickly and easily.

With your tactic, the only advantage you can have is that you think you've seen some untapped market share of the industry. It won't remain hidden for long. And you can't compete against all of us.

But we can work together very well.