I had no idea about the amount of leaking, but it makes sense. Unless you're actively checking every foot of gas pipe everywhere, chances are it's leaking here and there. But it's too bad. I learned while doing process control in a plant with steam heated processes, that you can run a lot of power down a gas pipe. I have a hunch that they could heat all of NYC from just waste heat.
The hob itself costs more, and the cheapest pans aren't compatible. Gas is often cheaper to run.
Other than initial purchase price, a normal electric hob has no advantages.