I don't think you understand how this works. I can charge you $10 for a candy bar with GST included and make $.95, or I can charge $10 + 5 cents gst and make $10.

It's not at all the same thing as you previously suggested.

The entire point of this conversation here is that $10 + 5 cents gst is a price increase if you weren't bothering to charge a tax at all.